通过getElementsByName获得span标签

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在Firefox下可以通过name属性获取span标签<span name="a">ddd</span><span name="a">eee</span><span name="a">ggg</span><mce:script type="text/javascript"><!--var obj=document.getElementsByName("a");alert(obj.length);// --></mce:script>在IE下运行会发现得到的元素个数为0，也就是获取不到，IE下改成这样：<span id="a">ddd</span><span id="a">eee</span><span id="a">ggg</span><mce:script type="text/javascript"><!--var obj=document.getElementsByName("a");alert(obj.length);// --></mce:script>就可以了……