<a href="#" name="xxx">abc@xxx.com</a>
<a href="#" name="xxx">http://abc.com</a>
<a href="#" name="xxx">yyyyy</a>
<a href="#" name="xxx">abc@xxx.com</a>
<script type="text/javascript">
var links = document.getElementsByName("xxx");
for(var i = 0;i < links.length;i ++)
{
        links[i].href="http://lalala.hehehe.pi/1.bla";
}
</script>

<a href="javascript: void(0)" name="B">abc@xxx.com</a><br>
<a href="javascript: void(0)" name="B">ttp://abc.com</a><br>
<a href="javascript: void(0)" name="B">yyyyy</a><br>
<a href="javascript: void(0)" name="B">abc@xxx.com</a><br>

<script type="text/javascript">
var links = document.getElementsByName("B");
for(var i = 0;i < links.length;i ++)
{
        alert( links[i].innerText);
        links[i].setAttribute("href","http://www.baidu.com/1.bla");
        alert( links[i].innerText);
}
</script>