]<script>
function locate(){
var input= document.getElementById("no").value;
document.getElementById("no").focus();
var reg = /^[1-9]\d{4,9}$/;
if(!reg.test(input)){
alert("非法的QQ号码");
document.getElementById("no").select();
return;
}
document.getElementById("ifrHtmlEditor").src = "http://wpa.qq.com/msgrd?V=1Uin="+input+"Site=www.qq.comMenu=yes";
document.getElementById("no").select();
}
function document_onkeyup() {
if (event.keyCode==13)
locate();
if (event.keyCode==8)
return;
if( (event.keyCode >= 47 && event.keyCode <= 57) || (event.keyCode >= 0x60 && event.keyCode <= 0x69) )
event.returnValue = true;
else
event.returnValue =false;
}
function window_onload()
{
document.getElementById("no").focus();
}
</script>
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
