<img id='banner1' src="data:images/banner.jpg" usemap="#banner" border="0"/>
<map name="banner" >
<area id='111' shape="rect" coords="x1,y1,x2,y2" href="/swt/">
</map>
<script>
var picw = $("#banner1").width(); /获取图片宽度
var pich = $("#banner1").height();
var x1 = parseInt(picw*0.6421); /计算出坐标与总长度的商，当做参数
var y1 = parseInt(pich*0.3907);
var x2 = parseInt(picw*0.9343);
var y2 = parseInt(pich*0.5189);
$("#111").attr("coords",'"'+x1+','+y1+','+x2+','+y2+'"'); /设置area的坐标
</script>
这样图片就能实现自适应了