The trim function of JavaScript can be used under Firefox without any problem
<script language="javascript"> var test1 = " aa "; test1 = test1.toString(); test1 = test1.trim(); </script>
There is no problem when using this method under Firefox, but an error occurs under IE
Then we can modify it
String.prototype.trim=function(){return this.replace(/(^\s*)|(\s*$)/g,"");}Add this sentence to the header, and the above can be run under both IE and FF
Methods provided by JQuery:
<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<button>Show Trim Example</button>
<script>
$("button").click(function () {
var str = " lots of spaces before and after ";
alert("'" + str + "'");
str = jQuery.trim(str);
alert("'" + str + "' - no longer");
});
</script>
</body>
</html>
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
