要求是只能输入英文和数字的混合,注意不能为纯英文或纯数字,更不能为除英文和数字之外的值<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script>
function test(){
var reg = ?
alert(reg.test("1112a"));
alert(reg.test("1112"));
alert(reg.test("a"));
alert(reg.test("#")); }
</script>
</HEAD> <BODY onLoad="test()">
</BODY>
</HTML>
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script>
function test(){
var reg = ?
alert(reg.test("1112a"));
alert(reg.test("1112"));
alert(reg.test("a"));
alert(reg.test("#")); }
</script>
</HEAD> <BODY onLoad="test()">
</BODY>
</HTML>
/^[a-zA-Z0-9]+$/这个只能判断字母数字组成。但是是否是纯数字或纯字母