JS案例：计算账单金额
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<meta charset="utf-8">
<title>商品统计总价示例</title>
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<script type="text/javascript">
var list=100; //标价
var rate=0.05; //税率
var tax; //税金
var totle; //总金额
tax=list*rate; //税金等于标价*税率
totle=list+tax; //总金额等于标价+税金
document.writeln("商品的总金额="+totle);
document.writeln("商品的税金="+tax);
</script>
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