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113 lines
3.7 KiB
Markdown
113 lines
3.7 KiB
Markdown
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https://www.w3school.com.cn/html5/tag_map.asp
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```html
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<img src="planets.gif" alt="Planets" usemap ="#planetmap" />
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<map name="planetmap">
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<area shape ="rect" coords ="0,0,110,260" href ="sun.htm" alt="Sun" />
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<area shape ="circle" coords ="129,161,10" href ="mercur.htm" alt="Mercury" />
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<area shape ="circle" coords ="180,139,14" href ="venus.htm" alt="Venus" />
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</map>
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```
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http://www.divcss5.com/html5/h54844.shtml
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```html
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首先让我们来看一下htmlmap标签是什么：
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htmlmap标签:定义一个客户端图像映射。图像映射（image-map）指带有可点击区域的一幅图像。
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定义map：
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<mapid="im_map" name="im_map">
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<areashape="rect" coords="0,0,100,100"href="url.html"/>
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</map>
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map标签定义map，area标签定义可点击的热点，area属性;
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shape：定义热点形状，可选参数rect(矩形)、circle(圆形)、poligon(自定义形状)。
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coords：定义形状路径;
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当shape=rect时，四个数字依次为：起点X、起点Y、终点X、终点Y
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当shape=circle时，三个数字依次为：中心点X、中心点Y、半径
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当shape=poligon时，可定义多个路径点，依次为：起点X、起点Y、路径1X、路径1Y、路径2X、路径2Y......
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href定义点击跳转的地址。
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htmlmap标签必需的属性：
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id：unique_name：为map标签定义唯一的名称。
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htmlmap标签可选的属性：
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name：mapname：为image-map规定的名称。
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map标签在HTML中的结构：
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1、coords的对应坐标不用变，只需在JS里面改变其比例就OK！
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<divclass="map_img">
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<imgclass="mapImg" usemap="mapName"src="isphoto/abc.png"alt=""style="width:450px">
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<mapname="mapName">
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<!--方形区域写法-->
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<!--<areashape="rect"coords="605,250,660,305"target="_blank"href="javascript:alert(1);"alt=""/>-->
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<areashape="circle" coords="633,276,28"target="_blank"href="javascript:alert('汽车图标');"alt=""/>
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</map>
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</div>
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2、如果有多张图片，一张图片对应一个map，class不用变，改变map的name值和对应的usemap值就好。name=usemap他们俩是一对CP哦，不要分开它们，给他们一样的值。
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<divclass="map_img">
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<imgclass="mapImg" usemap="mapName"src="isphoto/abc.png"alt=""style="width:450px">
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<mapname="mapName">
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<areashape="circle" coords="633,276,28"target="_blank"href="javascript:alert('汽车图标');"alt=""/>
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</map>
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<!--一张图片对应一个name和usemap-->
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<imgclass="mapImg" usemap="mapName2"src="isphoto/abc.png"alt=""style="width:450px">
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<mapname="mapName2">
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<areashape="circle" coords="633,276,28"target="_blank"href="javascript:alert('第二张图的汽车图标');"alt=""/>
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</map>
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</div>
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html<map>标签常用在为图像的某区域添加超链接！
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用法如下：
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<imgsrc="planets.gif" alt="无法显示此图像" usemap="#planetmap"/>
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<mapid="planetmap" name="planetmap">
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<areashape="rect" coords="0,0,82,126"href="sun.htm"alt="Sun"/>
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<areashape="circle" coords="90,58,3"href="mercur.htm"alt="Mercury"/>
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<areashape="circle" coords="124,58,8"href="venus.htm"alt="Venus"/>
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</map>
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usemap属性获取<map>标签信息，<area>标签定义一个链接区域，shape属性定义区域形状，coords属性定义链接区域的起点坐标和终点坐标
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注释：area元素永远嵌套在map元素内部。area元素可定义图像映射中的区域。
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注释：<img>中的usemap属性可引用<map>中的id或name属性（取决于浏览器），所以我们应同时向<map>添加id和name属性。
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```
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