getElementsByTagName and getElementsByClassName no

问题:

This question already has an answer here:

• getElementsByClassName() doesn't work in old Internet Explorers like IE6, IE7, IE8 5 answers

Sample Source:

 <div>      
            <br />
         <a name="IDATLQHE"></a>
        <h2 class="subhead" xmlns="">
         <div class="dummy">
             <div class="dummyy">
                <span>abcd</span>
            </div>

            <div class="dummyyy">
                <span>
                        <a title="google" href="http://google.com">google.com</a>
                </span>
          </div>                
        </div>
        </h2>       
    </div>

Output needed:

I want to replace the contents of the <a> element in the <div class="dummyyy"> element with the contents of the <div class="dummyy"> element.

JavaScript written:

<script type="text/javascript">
    var divs = document.getElementsByClassName('dummy');
    for(var i = 0, len = divs.length; i < len; i++)
    {
        var div = divs[i],
        h2 = div.getElementsByClassName('dummyyy'),
        h3 = div.getElementsByClassName('dummyy');
        if(h2.length === 1)
        {
            var aa= h2[0],
            aaa=aa.getElementsByTagName('a');
            if(h2.length === 1 && h3.length === 1)
            {
                aaa[0].innerHTML = h3[0].innerHTML;
                h3[0].innerHTML=null;
            }
        }
    }

This script is working fine in Firefox, but not in IE.

Error at:

 getElementsByClassName 
 aaa=aa.getElementsByTagName('a')

Can any one help on this.

Thanks

回答1:

getElementsByClassName is not supported by IE8. If you don't require IE7 support, you can replace it with div.querySelectorAll(".dummyy")

回答2:

getElementsByClassName() is implemented by all current browsers except IE8 and earlier. IE8 does support querySelectorAll()