Through the previous learning, we can successfully render the data source into the HTML DOM element in Vue, but many times we hope to control the data source. That is, data binding and communication with it. Simply put, how to implement two-way binding of data in Vue. This scenario is usually in the form operation scenario. This can be achieved in Vue using the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive. However, in this article we are only here to learn the use of the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive, but we will not explore the principle of two-way binding of Vue data. If you are interested in the principle, you can read this article.

Basic usage

In Vue, use {{}} or v-text , you can render data from the data source into DOM elements. (Learning video sharing: vue video tutorial)

For example:

<!-- Template -->
<h1>{{ message }}</h1>

let app = new Vue({
    el: &#39;#app&#39;,
    data: {
        message: &#39;Hello W3cplus! (^_^)&#39;
    }
})

Based on the above example, let’s modify it Requirements, we want to modify {{message}} through an input of <input>. At this time we need to use Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue. Let’s look at the example first, and then talk about Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue. Add an input based on the above example. The modified template code is as follows:

<!-- Template -->
<div id="app">
    <div>
        <input type="text" Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="message" placeholder="Hello W3cplus!(^_^)" />
    </div>
    <h1>{{ message }}</h1>
</div>

As can be seen from the effect, modify The value value of input and the content of the corresponding h1 element are also modified. This effect is the effect of two-way data binding.

The key point here is the use of the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue command. In Vue, you can use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive to create two-way data binding on a form control element. It automatically chooses the correct method to update the element based on the control type. Although somewhat magical, Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue is essentially just syntactic sugar. It is responsible for listening to user input events to update data, and specially handle some extreme cases.

Note: Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue will ignore the value, checked, selected attributes of all form elements initial value. Because it will select Vue instance data as the specific value. You should declare the initial value via JavaScript in the component's data option.

In Vue, Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue is mainly used for form controls. So next, let's take a look at how Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue is used on common form controls.

Single-line text input box

The example demonstrated previously is actually the effect of a single-line text input box. input binds the value of Vue’s data source through Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue. When the input input value changes, the data will also change accordingly, and the interpolation of element rendering will also change accordingly.

The data here can be object or function, but the data of the component can only be function , this is because each component has its own data, rather than a shared relationship. However, today we will not look at the two-way binding of data in components, but simply look at the form controls. Without digressing, let’s return to the input box. We usually write code in the template like the following:

<!-- Template -->
<div id="app">
    <div>
        <input type="text" Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="message" placeholder="Hello W3cplus!(^_^)" />
    </div>
    <h1>{{ message }}</h1>
</div>

Similarly, in the Vue instance, you need to specify data, our example refers to message:

let app = new Vue({
    el: '#app',
    data: {
        message: 'Hello W3cplus! (^_^)'
    }
})

Refresh your browser. When you modify the input value of input, you can see the corresponding synchronous changes in the content of the h1 element. The effect is as shown below :

Multi-line text area

Multi-line text areatextarea and input Very similar. For example, change the input in the above example to the textarea form element, and similarly bind Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="message" to textarea element. The template code is as follows:

<!-- Template -->
<div id="app">
    <div>
        <textarea Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="message" cols="30" rows="5"></textarea>
    </div>
    <h2>{{ message }}</h2>
</div>

When we modify the content in textarea, the corresponding h2 will also change:

小結(jié)一下：當(dāng)使用文本input(包括email，number等)或textarea時(shí)，Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="varName"等價(jià)于:value="varName" @input="e => varName = e.target.value"。這意味著每次輸入完成后的varName將被更新為輸入的值，然后輸入的值被設(shè)置為varName。正常的select元素也會(huì)像這樣，盡管multiple多項(xiàng)選擇有所不同。

在文本區(qū)域插值 (<textarea></textarea>) 并不會(huì)生效，應(yīng)用 Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue 來代替。

復(fù)選框

在Vue中的復(fù)選框通過Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue綁定數(shù)據(jù)源，并不和我們Web表單中的復(fù)選框一樣。比如下面的示例：

<!-- Template -->
<div>
    <input type="checkbox" Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="checked" id="checkbox" />
    <label for="checkbox">{{checked}}</label>
</div>

// JavaScript
let app = new Vue({
    data: {
        checked: false
    }
})

刷新瀏覽器，當(dāng)復(fù)選框選中的時(shí)候，checked的值false就變成了true。如下圖所示：

不知道你跟我是不是同樣的好奇，如果input復(fù)選框設(shè)置了checked（默認(rèn)選中），會(huì)不會(huì)刷新瀏覽器，checked的值會(huì)不會(huì)變成true。從實(shí)戰(zhàn)來看，是不會(huì)有變化的，只有選中之后，false才會(huì)變成true。另外再試一個(gè)效果，如果checked默認(rèn)值不是false，是任何字符串，看看是什么效果？

是不是很神奇，雖然默認(rèn)選中，并且點(diǎn)擊之后就在false和true之間切換。

上面的示例，咱們只使用單個(gè)復(fù)選框，從效果上告訴我們Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue會(huì)將其視為布爾值，并且會(huì)忽略該value。而且：

<input type="checkbox" value="foo" Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="isChecked" />

將和下面的代碼相同：

<input type="checkbox" value="foo" :checked="!!isChecked" @change="e => isChecked = e.target.checked" />

如果想要它是非布爾值，可以使用true-value和false-value屬性，它控制當(dāng)選擇復(fù)選框時(shí)，模型將被設(shè)置成什么值。

<input type="checkbox" value="foo" Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="isChecked" true-value="1" false-value="0">

與以下代碼相同

<input type="checkbox" value="foo" :checked="isChecked ==&#39;1&#39;" @change="e => isChecked = e.target.checked？&#39;1&#39;:&#39;0&#39;">

單一復(fù)選框的情況差不多就是這樣。如果有多個(gè)復(fù)選框共享一個(gè)數(shù)據(jù)源（Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue指定的值），那么這些復(fù)選框?qū)⑻畛湟粋€(gè)數(shù)組，其值為所有勾選的復(fù)選框，但一定要在數(shù)據(jù)源中指定數(shù)據(jù)是一個(gè)數(shù)組類型，否則會(huì)產(chǎn)生一些奇怪的現(xiàn)象。來看一個(gè)多選項(xiàng)的示例：

<!-- Template -->
<div>
    <input type="checkbox" id="jack" value="Jack" Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="checkedNames">
    <label for="jack">Jack</label>
    <input type="checkbox" id="john" value="John" Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="checkedNames">
    <label for="john">John</label>
    <input type="checkbox" id="mike" value="Mike" Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="checkedNames">
    <label for="mike">Mike</label>
</div>
<div>選中的值：{{checkedNames}}</div>

// JavaScript
var app = new Vue({
    el: &#39;#app&#39;,

    data: {
        checkedNames: []
    }
})

效果如下：

當(dāng)我們使用多個(gè)復(fù)選框時(shí)，true-value和false-value屬性不再有效。同時(shí)在模板中像上面示例使用方式，很難保證一致性，所以最好的方式是將一些邏輯移到組件的方法上。不過我們這節(jié)并不介紹怎么應(yīng)用到組件中，因?yàn)槲覀冞€沒有學(xué)習(xí)Vue的組件怎么創(chuàng)建。如果你感興趣的話，可以觀注后續(xù)更新的內(nèi)容，我們將會(huì)花一節(jié)內(nèi)容來看看怎么完成自定義的復(fù)選框組件。

單選按鈕

Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue在單選按鈕上的使用，咱們先來上實(shí)例代碼吧：

<!-- Template -->
<div id="app">
    <div>
        <input type="radio" Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="selected" value="CSS" id="css"/>
        <label for="css">CSS</label>
        <input type="radio" Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="selected" value="HTML" id="html"/>
        <label for="html">HTML</label>
        <input type="radio" Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="selected" value="JavaScript" id="javascript"/>
        <label for="javascript">JavaScript</label>
        <br>
        <div>你最喜歡的是：{{selected}}</div>
    </div>
</div>
 
// JavaScript
var app = new Vue({
    el: &#39;#app&#39;,
 
    data: {
        selected: null
    }
})

更新瀏覽器，看到的效果如下：

選擇框

Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue在選擇框上的使用，可以運(yùn)用在單項(xiàng)選擇框和多項(xiàng)選擇框，不同的是，多項(xiàng)選擇框在數(shù)據(jù)源中應(yīng)該是一個(gè)數(shù)組。比如下面的示例：

<!-- Template -->
<div id="app">
    <h1>選擇框</h1>
    <div>
        <select Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="selected">
            <option disabled value="">請(qǐng)選擇</option>
            <option>CSS</option>
            <option>HTML</option>
            <option>JavaScript</option>
        </select>
        <span>請(qǐng)選擇: {{ selected }}</span>
    </div>
    <div>
        <select Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="multipleSelected" multiple>
            <option>CSS</option>
            <option>HTML</option>
            <option>JavaScript</option>
            <option>PHP</option>
        </select>
        <span>請(qǐng)選擇:{{multipleSelected}}</span>
    </div>
</div>

// JavaScript
var app = new Vue({
    el: &#39;#app&#39;,

    data: {
        selected: null,
        multipleSelected: []
    }
})

效果如下：

如果 Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue 表達(dá)初始的值不匹配任何的選項(xiàng)，<select> 元素就會(huì)以”未選中”的狀態(tài)渲染。在 iOS 中，這會(huì)使用戶無法選擇第一個(gè)選項(xiàng)，因?yàn)檫@樣的情況下，iOS 不會(huì)引發(fā) change 事件。因此，像以上提供 disabled 選項(xiàng)是建議的做法。

對(duì)于選擇框，如果是動(dòng)態(tài)選擇框的話，我們可以利用前面學(xué)習(xí)的v-for指令來幫助我們：

<!-- Template -->
<div id="app">
    <select Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="selected">
        <option v-for="option in options" v-bind:value="option.value">
            {{ option.text }}
        </option>
    </select>
    <div>你選擇了: {{ selected }}</div>
</div>
// JavaScript
let app = new Vue({
    el: &#39;#pp&#39;,
    data: {
        selected: &#39;請(qǐng)選擇&#39;,
        options: [
            { text: &#39;One&#39;, value: &#39;CSS&#39; },
            { text: &#39;Two&#39;, value: &#39;HTML&#39; },
            { text: &#39;Three&#39;, value: &#39;JavaScript&#39; }
        ]
    }
})

效果是什么樣呢？自己動(dòng)手寫一下。這里我們用到了Vue的一個(gè)新指令，那就是v-bind指令，他有什么功能或特性呢？咱們后續(xù)會(huì)學(xué)習(xí)。

上面向大家展示了Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue指令在常見的表單控件上的使用情況。建議大家自己動(dòng)手?jǐn)]一下代碼，體會(huì)將會(huì)更深。

Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue的修飾符

Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue還有一些修飾符的功能，主要有.lazy、number和.trim。其主要功能是：

• .lazy：默認(rèn)情況下，Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue在input事件中同步輸入框的值與數(shù)據(jù)，但添加了.lazy修飾符之后，從而轉(zhuǎn)變?yōu)樵?code>change事件中同步。簡(jiǎn)單點(diǎn)說就是延遲了
• .number：如果想自動(dòng)將用戶的輸入值轉(zhuǎn)換為Number類型（如果原值的轉(zhuǎn)換結(jié)果為NaN則返回原值），可以添加.number修飾符給Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue來處理輸入值
• .trim：如果要自動(dòng)過濾用戶輸入的首尾空格，可以添加.trim修飾符給Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue上過濾輸入

路們來看一個(gè)示例：

<!-- Template -->
<div id="app">
    <ul>
        <li>
            <label>不帶任何修飾符：</label>
            <input type="text" Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue="message" placeholder="Hello W3cplus!(^_^)" />
            <span>{{message}}</span>
        </li>
        <li>
            <label>帶.lazy修飾符：</label>
            <input type="text" Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue.lazy="message" placeholder="Hello W3cplus!(^_^)" />
            <span>{{message}}</span>
        </li>
        <li>
            <label>帶.number修飾符：</label>
            <input type="text" Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue.number="message" placeholder="Hello W3cplus!(^_^)" />
            <span>{{message}}</span>
        </li>
        <li>
            <label>帶.trim修飾符：</label>
            <input type="text" Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue.trim="message" placeholder="Hello W3cplus!(^_^)" />
            <span>{{message}}</span>
        </li>
    </ul>
</div>

// JavaScript
var app = new Vue({
    el: &#39;#app&#39;,

    data: {
            message: &#39;Hello W3cplus!(^_^)&#39;,
    }
})

刷新頁(yè)面看效果：

從上在的效果可以看出：

• 不帶修飾符：修改input的值，message立馬變同步input的輸入值
• 帶.lazy修飾符： 修改input的值，message并不會(huì)立馬同步input的輸入值，只有當(dāng)input失去焦點(diǎn)時(shí)，message才會(huì)同步input的輸入值
• 帶.number修飾符： 當(dāng)輸入框的值，以數(shù)字加其他字符組合的內(nèi)容，會(huì)自動(dòng)去除其他的字符，只留數(shù)字；如果是其他字符加數(shù)字組合的內(nèi)容，并不會(huì)刪除其他字符，只留數(shù)字。一般帶.number修飾符的input控制配合type="number"配合使用
• 帶.trim修飾符：?input輸入框開始或末尾有空字符，將會(huì)自動(dòng)刪除空字符，如果空字符在其他字符中間，則不會(huì)刪除空字符

總結(jié)

這篇文章主要學(xué)習(xí)了Vue中的Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue的簡(jiǎn)單功能，就是和表單控件實(shí)現(xiàn)雙向數(shù)據(jù)綁定。其實(shí)很多時(shí)候HTML內(nèi)建的input類型有時(shí)不能滿足我們的需求。這個(gè)時(shí)候有需要通過Vue的組件系統(tǒng)來創(chuàng)建自定義行為而且可復(fù)用的input類型。這些input類型甚至可以和Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue一起使用。這就涉及到了Vue的組件。那么Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue怎么和組件一起使用呢？我們后續(xù)將會(huì)學(xué)習(xí)這部分，因?yàn)閷W(xué)習(xí)這部分內(nèi)容，需要對(duì)組件有一定的了解。

原文地址：https://www.w3cplus.com/vue/Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the Detailed examples of how to use the v-model directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue directive in Vue.html

（學(xué)習(xí)視頻分享：web前端開發(fā)、編程基礎(chǔ)視頻）

The above is the detailed content of Detailed examples of how to use the v-model directive in Vue. For more information, please follow other related articles on the PHP Chinese website!