JavaScript ?? ???? ???? JS ?? ??
JS? ???? ?? ?????
?? ? ?? ??
value="+" ? value="-"? onclick ???? ?????
<input type="button" value="-" onclick="minus()"/>
<input type="button" value="+" onclick="add()"/ >
?? <script></script> ??? js ??? ?????
//+ ??? ????
function add(){
//?? ???? ?? ????? Quantity
var num=document.getElementById("text").value;
//??? 1? ?? ?? ???? <inpue> ?? ??
+ +num;
document.getElementById("text").value=num;
//?? ???? ?? ??? ??? ?? ????. ??? ??? ??? ?? div? ??? ??? ?????. Content
var Price=document.getElementById("price").innerHTML;
var subtotal=price*num;
document.getElementById("subtotal").innerHTML=price*num;
}
//- ??? ????
function minus(){
?? ??= document.getElementById("text").value;
//?? ?? ?? ??? 1 ??? ??, 1 ??? ?? ?? ?? 0
? ?????. if(--num<1){
document.getElementById("text").value=0;
}else{
document.getElementById("text").value=num
}
//?? ???? ??? ?? ??? ??? ??? ?? div? ??? ?? ??? ??
//??? ?? ?? num=-1
var num=document.getElementById("text").value;
var Price=document.getElementById("price") innerHTML;
??? ??? ????. getElementById("subtotal").innerHTML=price*num;
｝
??? ??? ????.
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta name="format-detection" content="telephone=no" />
<title>簡(jiǎn)易購(gòu)物車(chē)</title>
<meta charset="utf-8" />
<style>
.shop{
width:400px;
background-color:#f0f0f0;
text-align:center;
}
.shop2{
text-align:center;
clear:both;
border:1px solid black;
height:21px;
}
.goods{
float:left;
width:100px;
}
.price{
float:left;
width:50px;
}
.number{
float:left;
width:110px;
}
.subtotal{
float:left;
width:50px;
margin-top:2px;
}
.delete{
float:left;
width:35px;
margin-left:5px;
}
.text{
width: 22px;
text-align:center;
}
</style>
<script >
//按下+按鈕
function add(){
//取出當(dāng)前頁(yè)面的數(shù)量
var num=document.getElementById("text").value;
//將數(shù)量加一然后再賦值給顯示數(shù)量的<inpue>中的value屬性
++num;
document.getElementById("text").value=num;
//取出當(dāng)前頁(yè)面的數(shù)量，與數(shù)量相乘，賦值給小計(jì)所屬的div的頁(yè)面顯示內(nèi)容
var price=document.getElementById("price").innerHTML;
var subtotal=price*num;
document.getElementById("subtotal").innerHTML=price*num;
}
//按下-按鈕
function minus(){
var num=document.getElementById("text").value;
//判斷數(shù)量是不是負(fù)數(shù)
if(--num<1){
document.getElementById("text").value=0;
}else{
document.getElementById("text").value=num
}
//取出當(dāng)前頁(yè)面的數(shù)量，與數(shù)量相乘，賦值給小計(jì)所屬的div的頁(yè)面顯示內(nèi)容
//給num重新賦值是放置出現(xiàn)num=-1情況
var num=document.getElementById("text").value;
var price=document.getElementById("price").innerHTML;
document.getElementById("subtotal").innerHTML=price*num;
}
</script>
</head>
<body>
<!--購(gòu)物車(chē)標(biāo)題-->
<div class="shop">
<div class="title">簡(jiǎn)易購(gòu)物車(chē)</div>
<div class="goods">商品</div>
<div class="price">單價(jià)</div>
<div class="number">數(shù)量</div>
<div class="subtotal">小計(jì)</div>
<div class="delete">操作</div>
</div>
<!--商品內(nèi)容-->
<div class="shop2" id="shop2">
<form>
<div class="goods">小米MIX </div>
<div class="price" id="price">5000</div>
<div class="number">
<input type="button" value="-" onclick="minus()"/>
<input type="text" value="1" class="text" id="text"/>
<input type="button" value="+" onclick="add()"/>
</div>
<div class="subtotal" id="subtotal">5000</div>
<div class="delete"><a href="#">刪除</a></div>
<form>
</div>
</body>
</html>+ ? - ??? ???? ?? ?????. ?? ??? ??? ???? ?? ??? ????? ?? ??? ?? ?? ????? ??? ? ???? id="text"? ??? ??? ?? ?? ???? ???? isNaN( ) ???? ??? ?? ?? ???? ?????
input? onblur ???? ????? ???? ?????.
<input type="text" value="1" class="text" id= "text" onblur="change( )"/>
JS ?? ???
//???? <input> ??? ??? ???? ??? ??? ? ??() ??? ??????. ???
?? ??(){
//??? ??? ??? ??? ?????. ???? ????? ??????
if(isNaN(document.getElementById("text").value)){
Alert("?????. a number") ;
document.getElementById("text").value=1;
}
//id="text"? ?? ?? ? ????
var num=document.getElementById("text").value;
//?? ?? ????
var Price=document.getElementById("price").innerHTML;
//?? subtotal
document.getElementById("subtotal").innerHTML=price*num;
}
?? ??
?? <div&g t; ?? ??? <? ???? div
<div class="delete" onclick="delect('shop2')"><a href="#">Delete<? onclick ???? ??????. ;/ a></div>
JS ??? ??? ????
function delect(){
//id? "shop2"? div? ??
document.body.removeChild(document.getElementById("shop2"));
}
? ???? ? ??? ?? ???????.
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta name="format-detection" content="telephone=no" />
<title>簡(jiǎn)易購(gòu)物車(chē)</title>
<meta charset="utf-8" />
<style>
.shop{
width:400px;
background-color:#f0f0f0;
text-align:center;
}
.shop2{
text-align:center;
clear:both;
border:1px solid black;
height:21px;
}
.goods{
float:left;
width:100px;
}
.price{
float:left;
width:50px;
}
.number{
float:left;
width:110px;
}
.subtotal{
float:left;
width:50px;
margin-top:2px;
}
.delete{
float:left;
width:35px;
margin-left:5px;
}
.text{
width: 22px;
text-align:center;
}
</style>
<script >
//按下+按鈕
function add(){
//取出當(dāng)前頁(yè)面的數(shù)量
var num=document.getElementById("text").value;
//將數(shù)量加一然后再賦值給顯示數(shù)量的<inpue>中的value屬性
++num;
document.getElementById("text").value=num;
//取出當(dāng)前頁(yè)面的數(shù)量，與數(shù)量相乘，賦值給小計(jì)所屬的div的頁(yè)面顯示內(nèi)容
var price=document.getElementById("price").innerHTML;
var subtotal=price*num;
document.getElementById("subtotal").innerHTML=price*num;
}
//按下-按鈕
function minus(){
var num=document.getElementById("text").value;
//判斷數(shù)量是不是負(fù)數(shù)
if(--num<1){
document.getElementById("text").value=0;
}else{
document.getElementById("text").value=num
}
//取出當(dāng)前頁(yè)面的數(shù)量，與數(shù)量相乘，賦值給小計(jì)所屬的div的頁(yè)面顯示內(nèi)容
//給num重新賦值是放置出現(xiàn)num=-1情況
var num=document.getElementById("text").value;
var price=document.getElementById("price").innerHTML;
document.getElementById("subtotal").innerHTML=price*num;
}
//用戶在<input>框中改變數(shù)字時(shí)，光標(biāo)失焦后觸發(fā)change()函數(shù)
function change(){
//判斷用戶輸入的是否為非數(shù)字，是則提醒用戶
if(isNaN(document.getElementById("text").value)){
alert("請(qǐng)輸入數(shù)字");
document.getElementById("text").value=1;
}
//取得id="text"的input框的value值
var num=document.getElementById("text").value;
//取得商品價(jià)格
var price=document.getElementById("price").innerHTML;
//將小計(jì)輸出出去
document.getElementById("subtotal").innerHTML=price*num;
}
function delect(){
//刪除id="shop2"的這個(gè)div
document.body.removeChild(document.getElementById("shop2"));
}
</script>
</head>
<body>
<!--購(gòu)物車(chē)標(biāo)題-->
<div class="shop">
<div class="title">簡(jiǎn)易購(gòu)物車(chē)</div>
<div class="goods">商品</div>
<div class="price">單價(jià)</div>
<div class="number">數(shù)量</div>
<div class="subtotal">小計(jì)</div>
<div class="delete">操作</div>
</div>
<!--商品內(nèi)容-->
<div class="shop2" id="shop2">
<form>
<div class="goods">小米MIX </div>
<div class="price" id="price">5000</div>
<div class="number">
<input type="button" value="-" onclick="minus()"/>
<input type="text" value="1" class="text" id="text" onblur="change()"/>
<input type="button" value="+" onclick="add()"/>
</div>
<div class="subtotal" id="subtotal">5000</div>
<div class="delete" onclick="delect()"><a href="#">刪除</a></div>
<form>
</div>
</body>
</html>
