<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jQuery实现购物车物品数量的加减</title>
<script type="text/javascript" class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
<script>
$(function(){
var t = $("#text_box");
$("#add").click(function(){
t.val(parseInt(t.val())+1)
setTotal();
})
$("#min").click(function(){
t.val(parseInt(t.val())-1)
setTotal();
})
function setTotal(){
$("#total").html((parseInt(t.val())*3.95).toFixed(2));
}
setTotal();
})
</script>
</head>
<body>
<p>单价：3.95</p>
<input id="min" name="" type="button" value="-" />
<input id="text_box" name="" type="text" value="4" />
<input id="add" name="" type="button" value="+" />
<p>总价：<label id="total"></label></p>
</body>
</html>
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