<title>计算三角形面积</title>
<script type="text/javascript">
var long=window.prompt("输入长度:","");
var width=window.prompt("输入宽度:","");
var hight=window.prompt("输入高:","");
var area=long*width/2;
if(!isNaN(area))
{
alert("三角形面积是:"+area);
}
else
{
alert("错误");
}
</script>
转载于:https://www.cnblogs.com/lookyou/archive/2011/09/02/2164373.html