image-map是一张带可点击区域的图片。
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HTML Image Maps
image-map是一张带可点击区域的图片，通常每一个区域是一个超级链接，点击这个区域可以访问相应的链接。
例子
<img src ="planets.gif"
width ="145" height ="126"
alt="Planets"
usemap ="#planetmap" />
<map id ="planetmap"
name="planetmap">
<area shape ="rect" coords ="0,0,82,126"
href ="sun.htm" target ="_blank"
alt="Sun" />
<area shape ="circle" coords ="90,58,3"
href ="mercur.htm" target ="_blank"
alt="Mercury" />
<area shape ="circle" coords ="124,58,8"
href ="venus.htm" target ="_blank"
alt="Venus" />
</map>
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效果演示
增加一些JavaScript代码
我们可以在image map的
标签上增加一些事件来调用JavaScript的函数。
标签支持的事件有onClick, onDblClick, onMouseDown, onMouseUp, onMouseOver, onMouseMove, onMouseOut, onKeyPress, onKeyDown, onKeyUp, onFocus, 和onBlur。
下面是在上面的例子中增加了一些JavaScript：
<html>
<head>
<script type="text/javascript">
function writeText(txt)
{
document.getElementById("desc").innerHTML=txt
}
</script>
</head>
<body>
<img src="planets.gif" width="145" height="126"
alt="Planets" usemap="#planetmap" />
<map id ="planetmap" name="planetmap">
<area shape ="rect" coords ="0,0,82,126"
onMouseOver="writeText('The Sun and the gas giant
planets like Jupiter are by far the largest objects
in our Solar System.')"
href ="sun.htm" target ="_blank" alt="Sun" />
<area shape ="circle" coords ="90,58,3"
onMouseOver="writeText('The planet Mercury is very
difficult to study from the Earth because it is
always so close to the Sun.')"
href ="mercur.htm" target ="_blank" alt="Mercury" />
<area shape ="circle" coords ="124,58,8"
onMouseOver="writeText('Until the 1960s, Venus was
often considered a twin sister to the Earth because
Venus is the nearest planet to us, and because the
two planets seem to share many characteristics.')"
href ="venus.htm" target ="_blank" alt="Venus" />
</map>
<p id="desc"></p>
</body>
</html>
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