为什么javascript：void（0）被认为有害？

Question

任何人都可以告诉我或指向一些资源，解释为什么在超链接中使用javascript:void(0)是有害的（特别是在Internet Explorer 6中）？

Answer 1

Use of the javascript: keyword in a link isn't recommended anyway. I've only managed to find one article on why it might be harmful:

a href=”javascript:void(0);” — avoid the void

But the general consensus shows that you shouldn't use it because it might confuse browsers without javascript support, for some of those browsers it could be parsed as an invalid link.

Instead, you should provide a link to a page either working around the functionality that would be provided by javascript or displaying a message about the site requiring javascript to work correctly. On the same link, return false; from your event, like so:

<a href="noscript.html" onclick="doSomething(); return false;">I'm a link</a>

Or alternatively, use return false; or preventDefault() and returnValue in your javascript code:

element.onclick = function ()
{
    /*
        // return false is better for most situations (see bobince's comment)
        if (event.preventDefault)
            event.preventDefault();
        else
            event.returnValue = false;
    */

    doSomething();

    return false;
}

Answer 2

点击<a href="javascript:void(0)" />触发事件“beforeunload”在对象“窗口”中IE（我已在IE10中测试过），但点击<a href="#" /> doesn'吨。