[转]Javascript自动删除输入框内的非数字

<input id="Text1" type="text"  onkeyup=checkNum(this) />

 

<script language="javascript" type="text/javascript" >
function checkNum(e){
     if(e.value=="")return;
     /^([0-9]*)/.exec(e.value);
     if(e.value != RegExp.$1)e.value=RegExp.$1;
}
</script>