<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<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(oLi){
var aBtn = oLi.getElementsByTagName('input');
var oStrong = oLi.getElementsByTagName('strong')[0];
var oEm = oLi.getElementsByTagName('em')[0];
var oSpan = oLi.getElementsByTagName('span')[0];
var n1 = Number(oStrong.innerHTML); // '0' => 0
var n2 = parseFloat(oEm.innerHTML); // '12.5元' => 12.5
aBtn[0].onclick = function (){
n1 --;
if ( n1 < 0 ) {
n1 = 0;
}
oStrong.innerHTML = n1;
oSpan.innerHTML = n1*n2 + '元';
};
aBtn[1].onclick = function (){
n1 ++;
oStrong.innerHTML = n1;
oSpan.innerHTML = n1*n2 + '元';
};
}
};
</script>
</head>
<body>
<ul id="list">
<li>
<input type="button" value="-" />
<strong>0</strong>
<input type="button" value="+" />
单价:<em>12.5元</em>
小计:<span>0元</span>
</li>
<li>
<input type="button" value="-" />
<strong>0</strong>
<input type="button" value="+" />
单价:<em>10.5元</em>
小计:<span>0元</span>
</li>
<li>
<input type="button" value="-" />
<strong>0</strong>
<input type="button" value="+" />
单价:<em>8.5元</em>
小计:<span>0元</span>
</li>
<li>
<input type="button" value="-" />
<strong>0</strong>
<input type="button" value="+" />
单价:<em>8元</em>
小计:<span>0元</span>
</li>
<li>
<input type="button" value="-" />
<strong>0</strong>
<input type="button" value="+" />
单价:<em>14.5元</em>
小计:<span>0元</span>
</li>
</ul>
<p>
商品合计共:0件,共花费了:0元<br />
其中最贵的商品单价是:0元
</p>
</body>
</html>
通过按钮改变数量,统计出总价