以下是引用片段：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>雨哲在线(Yz81.Com)－网页设计教程</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<SCRIPT LANGUAGE="JavaScript">
<!--
var request = {
QueryString : function(val) {
var uri = window.location.search;
var re = new RegExp("" +val+ "=([^&?]*)", "ig");
return ((uri.match(re))?(uri.match(re)[0].substr(val.length+1)):null);
}
}
var a = request.QueryString ("a");
var b = request.QueryString ("b");
var c = request.QueryString ("c");
if ((a != null)){a=a} else{a="参数A为空"}
if ((b != null)){b=b} else{b="参数B为空"}
if ((c != null)){c=c} else{c="参数C为空"}
document.writeln("参数A: " + a);
document.writeln("<br>参数B: " + b);
document.writeln("<br>参数C: " + c);
//-->
</SCRIPT>
</head>
<body>
<form name="form1" action="?">
请输入参数值:<br>
<SCRIPT LANGUAGE="JavaScript">
document.writeln("A:<input type=’text’ name=’a’ value=’"+a+"’><br>");
document.writeln("B:<input type=’text’ name=’b’ value=’"+b+"’><br>");
document.writeln("C:<input type=’text’ name=’c’ value=’"+c+"’><br>");
</SCRIPT>
<input type="submit" name="Submit" value="提交参数查看效果">
</form>
</body>
</html>
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