are text.trim() really can't work in IE8

when i test my web-page in chrome and firefox they work fine. but in IE it does not worked.

i found that

(" .class li"开发者_如何转开发).text().trim() not worked in IE he give me error that

Object doesn't support this property or method. but in FF and chrome they work fine. are i goes something wrong to handle this.

Try this:

$.trim($(".class li").text());

The reason that it doesn't worked in your case is because the trim method you were calling was wasn't jquery.trim method. It is a method you were calling on a object instance (.text() returns a string). So some browsers have this method built-in while IE doesn't.

String.trim is not part of the old language specification, it is a new kid in town. Fortunetely you can easily add this function.

if (typeof String.prototype.trim != "function") {
  String.prototype.trim = function () {
    return this.replace(/^\s+|\s+$/g, '');
  };
}

Now you can trim any String you want:

" just do it   ".trim()
$(" .class li").text().trim()

If you want to remove both leading and trailing spaces you need to use

replace(/^\s+|\s+$/g, '')