只允许输入数字,其它键没有反应

<script language="JavaScript">
<!--
function chkInp(){
    var regCh = null;
    var regAll = null;
    switch(event.srcElement.jinzhi){
        case "bin": regCh = /[0-1]/; regAll = /^[0-1]*$/; break;
        case "oct": regCh = /[0-7]/; regAll = /^[0-7]*$/; break;
        case "hex": regCh = /[0-9a-fA-F]/; regAll = /^[0-9a-fA-F]*$/; break;
        default: regCh = /[0-9]/; regAll = /^[0-9]*$/; break;
    }
    switch(event.type){
        case "keypress": event.returnValue = regCh.test(String.fromCharCode(event.keyCode)); break;
        case "paste" : event.returnValue = regAll.test(window.clipboardData.getData("text")); break;
        case "drop" : event.returnValue = regAll.test(event.dataTransfer.getData("text")); break;
        case "blur" : if(regAll.test(event.srcElement.vlaue)) alert("输入非法"); return;
        default: break;
    }
}
//-->
</script>
<input type="text" jinzhi="" onkeypress="chkInp()" onpaste="chkInp()" ondrop="chkInp()" onblur="chkInp()"><br>
0123456789<br>
abcdefghijklmnopqrstuvwxyz<br>
ABCDEFGHIJKLMNOPQRSTUVWXYZ<BR>
 ~!@#$%^&*()_+}{":?><|,.//';[]=-<br>d