给area标签添加红色边框

给area标签添加红色边框

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

<title>无标题文档</title>

<script type="text/javascript">

function getOffset(obj){

    var x = obj.offsetLeft, y = obj.offsetTop;

    while(obj.offsetParent){

        obj = obj.offsetParent;

        x += obj.offsetLeft;

        y += obj.offsetTop;

    }

    return {x : x, y : y};

};

function showBorder(obj){

    var img = document.getElementById("bd");

    var div = document.getElementById("border");

    var offset = getOffset(img);

    var coords = obj.coords.split(",");



    div.style.display = "block";

    div.style.left = offset.x + parseInt(coords[0]) + "px";

    div.style.top = offset.y + parseInt(coords[1]) + "px";

    div.style.width = parseInt(coords[2]) - parseInt(coords[0]) + "px";

    div.style.height = parseInt(coords[3]) - parseInt(coords[1]) + "px";

}

function hideBorder(){

    document.getElementById("border").style.display = "none";

}

</script>

</head>

<body>

<img src="http://www.baidu.com/img/baidu_logo.gif" width="270" height="129" border="0" usemap="#bdMap" id="bd" />

<map name="bdMap" id="bdMap">

  <area shape="rect" coords="35,22,115,97" onmouseover="showBorder(this);" onmouseout="hideBorder()" />

  <area shape="rect" coords="158,26,238,94" onmouseover="showBorder(this);" onmouseout="hideBorder()" />

</map>

<div id="border" style="display:none; position:absolute;border:2px solid #FF0000; "></div>

</body>

</html>
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原文地址：https://www.cnblogs.com/zmc/p/9403740.html