[Javascript] - 숫자만 입력가능 사용법

onkeyup='checkNumber();' style='IME-MODE: disabled'

 function checkNumber(){

var objEv = event.srcElement;

var numPattern = /([^0-9|])/;

numPattern = objEv.value.match(numPattern);

if(numPattern != null){

alert("숫자만 입력해 주세요!");

objEv.value="";

objEv.focus();

return false;

}else{

return true;

}

}