js实现input输入框只能输入数字的功能

 1 <input type="text" style="ime-mode:disabled;" onpaste="return false;"  onkeypress="keyPress()" />
 2 
 3 function keyPress() {    
 4      var keyCode = event.keyCode;    
 5      if ((keyCode >= 48 && keyCode <= 57))    
 6     {    
 7          event.returnValue = true;    
 8      } else {    
 9            event.returnValue = false;    
10     }    
11 }