刚学菜鸟请教问题
用户随意（从大到小）输入两个数，求两个数之间的差怎么写
21视频那章不能看
好心人告诉下
程序代码：<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
</HEAD>
<BODY>
<input type="text" name="num1"> -
<input type="text" name="num2">
<input type="button" value=" = " onclick="cha()">
<input type="text" name="chazhi" >
<script>
function cha()
{
this.chazhi.value=this.num1.value-this.num2.value;
}
</script>
</BODY>
</HTML>