JavaScript 图像地图_area shape ="rect" coords ="0,0, 82, 126-优快云博客

本文链接：https://blog.youkuaiyun.com/Study_Live_Sun/article/details/90699279

博客介绍了图像地图是带有可点击区域的图像，每个区域是相关超级链接。给出创建带有可点击区域的html图像地图实例，还说明了可向图像地图内部的 <area> 标签添加能调用JavaScript的事件，并给出添加JavaScript后的例子。

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图像地图是带有可点击区域的图像。通常情况下，每个区域是一个相关的超级链接。单击某个区域，就回到达相关的链接。

实例

下面的例子演示如何创建带有可点击区域的 html 图像地图：

<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>

结果

添加 JavaScript

我们可向图像地图内部的 <area> 标签添加（能调用JavaScript的）事件。<area> 标签支持以下事件：onClick、onDblClick、onMouseDown、onMouseUp、onMouseOver、onMouseMove、onMouseOut、onKeyPress、onKeyDown、onKeyUp、onFocus和onBlur。

这是添加了 JavaScript 的上面的例子：

<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>