不得不输入数字的input

?

<input onkeydown="if( !event.shiftKey && (event.keyCode == 8 || event.keyCode == 9 || (event.keyCode >= 96 && event.keyCode <= 105) ||(event.keyCode >= 48 && event.keyCode <= 57) || event.keyCode==46|| event.keyCode==116)) {return true;} else {return false;}" type="text" />