[javascript] 연락처 숫자만 입력가능하도록

<script>
function num_only(){
if((event.keyCode<48) || (event.keyCode>57)){
event.returnValue=false;
}
}
</script>
 
<form name='test'>
    <input type=text name='numInputField' OnKeyPress="num_only()" style="ime-mode:disabled">
</form>
 
style="ime-mode:disabled" onkeyPress="if ((event.keyCode<48) || (event.keyCode>57)) event.returnValue=false;"