JS给a标签中的img赋值

 <a href="#" class="MagicZoom" id="A1"><img width="550" height="550" src="图片地址" id="A2" /></a>

 document.getElementById("A1").getElementsByTagName("img")[0].src =图片地址;

<div id="tsImgS"><a href="#" class="MagicZoom" id="MagicZoom"><img width="550" height="550" src="#" id="MagicZoom2" /></a></div>

document.getElementById("tsImgS").getElementsByTagName("img")[0].src="图片地址";

document.getElementById("tsImgS").getElementsByTagName("a")[0].href="地址";