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function IsDigit(cCheck) {
return (('0' <= cCheck) && (cCheck <= '9'));
}
if (IsDigit(cCheck)) {
namemsg.innerHTML = "(登录名不能以数字开头!)";
}
<script type="text/javascript">
var theforever_csdn1="a1";
var theforever_csdn2="11";
function theforever_csdn(str){
return /^(?![0-9])/.test(str)?'合格':'不合格';
}
alert(theforever_csdn(theforever_csdn1));
alert(theforever_csdn(theforever_csdn2));
</script>