要在JavaScript中搜索图像映射区域的替代文本（alt），请使用 alt 属性。您可以尝试运行以下代码以获取替代文本。
<!DOCTYPE html>
<html>
<body>
<img src = "/images/html.gif" alt = "HTML Map" border = "0" usemap = "#html"/>
<map name = "html">
<area id = "myarea" shape = "circle" coords = "154,150,59" href = "about.htm?id=company" alt = "Team" target = "_self" >
</map>
<script>
var x = document.getElementById("myarea").alt;
document.write("<br>Alternate Text: "+x);
</script>
</body>
</html>
