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Example code for using JS to allow only numbers to be entered in the text box

怪我咯
怪我咯Original
2017-04-01 09:34:121254browse

How to implement that the text box can only input numbers (compatible with IE Firefox)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script language="javascript" type="text/javascript"> 
//注意：火狐使用event时， 
function inputNum(evt){ 
  //火狐使用evt.which获取键盘按键值，IE使用window.event.keyCode获取键盘按键值
  var ev = evt.which?evt.which:window.event.keyCode;
  if(ev>=48&&ev<=57){
    return true;  
  }else{
    return false;
  } 
}  
</script>  
</head>
<body>
  <input type="text" onKeyPress="return inputNum(event);" > 
</body>
</html

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