'HTMLElement' is undefined in IE8, an alternative?

问题

Hey all I have methods like this:

// Has Class
HTMLElement.prototype.hasClass = function (searchClass) {
    return this.className.match(new RegExp('(\\s|^)' + searchClass + '(\\s|$)'));
}

In IE9 it works fine. In IE8 it gives me undefined... is there a simple work around?

回答1:

You can't add methods to HTMLElement.prototype in older versions of IE if I remember correctly. A simple workaround would be:

var hasClass = function (el, searchClass) {
    return el.className.test(new RegExp('(\\s|^)' + searchClass + '(\\s|$)'));
};

And used like:

alert(    hasClass(   document.getElementById('div1'), 'classToCheck'   )    )

DEMO

You can always add this to the Object.prototype object but it's frowned on

来源：https://stackoverflow.com/questions/8868004/htmlelement-is-undefined-in-ie8-an-alternative