获取a标签和script标签的绝对路径和相对路径

做了一个a标签和script标签获取绝对路径和相对路径的实验，实验代码如下：

<a id="link" href="a.html">a.html</a>
<script type="text/javascript" id="script" src='a.js'></script>
<script type="text/javascript">
    function $(id){
        return document.getElementById(id);
    }
    alert('link.href=>'+$('link').href);
    alert('link.get=>'+$('link').getAttribute('href'));
    alert('link.get0=>'+$('link').getAttribute('href',0));
    alert('link.get1=>'+$('link').getAttribute('href',1));
    alert('link.get2=>'+$('link').getAttribute('href',2));
    alert('link.get4=>'+$('link').getAttribute('href',4));

    alert('script.src=>'+$('script').src);
    alert('script.get=>'+$('script').getAttribute('src'));
    alert('script.get0=>'+$('script').getAttribute('src',0));
    alert('script.get1=>'+$('script').getAttribute('src',1));
    alert('script.get2=>'+$('script').getAttribute('src',2));
    alert('script.get4=>'+$('script').getAttribute('src',4));
</script>

分别在IE6~IE9（都是虚拟机原生，非ie9模拟）、chrome21、FF14，opera12.01，safari5.1.7中做出如下的实验结果:

√代表绝对路径，×代表相对路径（即src或者href属性的值，如果为完整的路径，则是完整路径）

方法 IE6 IE7 IE8 IE9 chrome 21 FF 14 safari 5.1.7 opera 12
link.href √ √ √ √ √ √ √ √
link.get √ √ × × × × × ×
link.get0 √ √ × × × × × ×
link.get1 √ √ × × × × × ×
link.get2 × × × × × × × ×
link.get4 √ √ × × × × × ×
script.src × × √ √ √ √ √ √
script.get × × × × × × × ×
script.get0 × × × × × × × ×
script.get1 × × × × × × × ×
script.get2 × × × × × × × ×
script.get4 √ √ × × × × × ×

详情见MSDN的介绍：http://msdn.microsoft.com/en-us/library/ms536429(v=VS.85).aspx.aspx)

前端开发