html如何创建图片热区（img usemap）？

    <img src="china.gif" usemap="#mymap">    <map name="mymap">     <area shape="rect" href="a.html" coords="0,0,50,50">     <area shape="circle" href="b.html" coords="120,80,50">     <area shape="poly" href="c.html" coords="0,0,50,50,100,100,200,200">    </map>

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