效果图：
代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
*{
margin: 0;
padding: 0;
}
body{
overflow-y: auto;
}
ul{
margin-top: 20px;
border-top: 1px solid #666;
}
h1{
width: 500px;
margin: 0 auto;
color: deeppink;
height: 100px;
line-height: 100px;
}
li{
list-style: none;
padding: 15px 0px 15px 60px;
border-bottom:1px solid #ccc;
font-size: 0px;
line-height: 30px;
/*height: 60px;*/
}
input[type=button],li strong,li em,li span,li div{
height: 30px;
font-size: 20px;
line-height: 30px;
text-align: center;
}
input[type=button],li strong
{
width: 60px;
}
li span,li em{
width: 80px;
background: pink;
}
li div{
width: 100px;
}
li strong,li span,li em,li div{
display: inline-block;
}
</style>
<script>
window.onload=function(){
var oUl=document.getElementById('list');
var aLi=oUl.getElementsByTagName('li');
for(var i=0;i<aLi.length;i++){
fn1(aLi[i]);
}
function fn1(aLi){
var aBtn=aLi.getElementsByTagName('input');
var aStrong=aLi.getElementsByTagName('strong')[0];
var aEm=aLi.getElementsByTagName('em')[0];
var aSpan=aLi.getElementsByTagName('span')[0];
var num=Number(aStrong.innerHTML); //aStrong.innerHTML='0'
var price=parseFloat(aEm.innerHTML);//aEm.innerHTML='12.9元'
aBtn[0].onclick=function(){
if(num>0)
{
num--;
aStrong.innerHTML=num;
aSpan.innerHTML=(num*price).toFixed(1)+'元'
}
}
aBtn[1].onclick=function(){
num++;
aStrong.innerHTML=num;
aSpan.innerHTML=(num*price).toFixed(1)+'元'
}
}
}
</script>
</head>
<body>
<h1>点点看，仿购物车+ -效果</h1>
<ul id="list">
<li>
<input type="button" value="-" />
<strong>0</strong>
<input type="button" value="+" />
<div class="s1">单价:</div><em>12.9元</em>
<div class="s1">共计：</div><span>0</span>
</li>
<li>
<input type="button" value="-" />
<strong>0</strong>
<input type="button" value="+" />
<div class="s1">单价:</div><em>45.7元</em>
<div class="s1">共计：</div><span>0</span>
</li>
<li>
<input type="button" value="-" />
<strong>0</strong>
<input type="button" value="+" />
<div class="s1">单价:</div><em>67.5元</em>
<div class="s1">共计：</div><span>0</span>
</li>
<li>
<input type="button" value="-" />
<strong>0</strong>
<input type="button" value="+" />
<div class="s1">单价:</div><em>14.7元</em>
<div class="s1">共计：</div><span>0</span>
</li>
<li>
<input type="button" value="-" />
<strong>0</strong>
<input type="button" value="+" />
<div class="s1">单价:</div><em>45.6元</em>
<div class="s1">共计：</div><span>0</span>
</li>
<li>
<input type="button" value="-" />
<strong>0</strong>
<input type="button" value="+" />
<div class="s1">单价:</div><em>32.4元</em>
<div class="s1">共计：</div><span>0</span>
</li>
</ul>
</body>
</html>
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