鼠标悬停微信图标显示二维码
用以下代码新建index.html文件，并上传两个图片文件，分别是“wechat.jpg”和“qrcode.jpg”，将鼠标悬停至微信图标（wechat图片）时，就会显示（qrcode图片）二维码。
<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8" />
<title>last.html</title>
<style>
</style>
<script type="text/javascript">
function show (obj)
{
var img = document.getElementById ("showimg");
if (img.src = obj.src)
{
img.src = "qrcode.jpg";
}
img.style.display = "";
img.style.position = "absolute";
img.style.left = obj.offsetleft + obj.width;
}
function hide ()
{
document.getElementById ("showimg").style.display = "none";
}
</script>
</head>
<body>
<img src="wechat.jpg" onmouseover="show(this)" onmouseout="hide()" width=18 height=18>
<br>
<img src="qrcode.jpg" id="showimg" style="display: none" height=88>
</body>
</html>
