There are three common methods for Vue.js to traverse arrays and objects: the v-for directive is used to traverse each element and render templates; the v-bind directive can be used with v-for to dynamically set attribute values ??for each element; and the .map method can convert array elements into new arrays.
Usage of Vue traversal
Vue.js provides a variety of ways to iterate over arrays and objects. This article will introduce the three most commonly used methods: v-for directive, v-bind directive, and .map method.
1. v-for directive
v-for directive is used to iterate through each element in an array or object and render a template for each element. The syntax is as follows:
<code class="html"><template v-for="item in items"> {{ item }} </template></code>
The above example will iterate over an array named items and render its content for each element.
2. v-bind instruction
The v-bind directive can be used to dynamically bind property values. With v-for directive, we can use it in conjunction with an array or object, thus setting the attribute value dynamically for each element.
<code class="html"><template v-for="item in items"> <div :class="item.class"></div> </template></code>
The above example will traverse items array and dynamically set the class attribute for each element, the attribute value taken from item.class .
3. .map method
The .map method converts each element in the array into a new array. In Vue.js, the .map method can be called in the following ways:
<code class="javascript">const newArray = this.items.map(item => item.value);</code>
The above example will iterate over the items array and create a new array containing only the element value newArray .
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