js 验证特殊字符
<!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 language="javascript">
function isCheckNumber(){
var numbercard=document.forms[0].num.value;
var numberpattern =/^[A-Za-z0-9_]{1,8}$/;
if(!numberpattern.test(numbercard)){
alert("
请输入有效的 只能是1-8位数字,字母或数字字母的组合");
document.forms[0].num.focus();
return false;
}
return true;
}
</script>
</HEAD>
<BODY>
<form>
number:<input type="text" name="num" id="num" onblur="
isCheckNumber()" value=""/>
</form>
</BODY>
</HTML>