Ctrl+/
IE11
F11
ESC
PgUp
PgDn
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>十字形坐标</title>
<style>
<!--
#leftright, #topdown{position:absolute;left:0;
top:0;width:1px;height:1px;layer-background-color:red;
background-color:red;z-index:100;font-size:1px;}
-->
</style>
</head>
<body>
<div id="leftright" style="width:expression(document.body.clientWidth-2)"></div><div
CSS代码...
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JS代码...