js-01

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<!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>js页面</title>
<script language="javascript">
function jisuan(){
var num1=document.forms.price.value;
var num2=document.forms.num.value;
var total=parseInt(num1)*parseInt(num2);
document.forms.sum.value=total;

if(num2!="")
{
if(parseFloat(num2)<0)
{
alert("数量不能小于零，请重新输入。。。");
var number=document.getElementsByTagName("num");
for (var i=0; i<number.length; i++)
{
number[i].onfocus = function ( ){
this.value = "";
}
}
document.getElementById("number1").focus();

}
document.getElementById("number1").focus();
}

else{
alert("您没有输入任何数据，请重新输入！！！");
document.getElementById("number1").focus();
return;
}
if((total>1000)&& (total<2000))
{
alert("购买总价超过100元\n赠送一条毛巾！！");

}
else{
alert("欢迎下次光临，谢谢！！");
}

}
</script>
</head>

<body>
<img src="黑武士.jpg" width="300px" height="300px"/><br />
<form action="#" method="get" name='forms'>
竞拍价格：<input type="text" name="price" value="120" disabled="disabled"/><br />
竞拍数量：<input type="text" name="num" id="number1" value=""/><br />
预计总价：<input type="text" name="sum" id="number2" value=""/><br />
<input type="button" name="button" value="计算总价" onclick="jisuan()"/>
</form>

</body>

</html>

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