请到原文查看 http://blog.csdn.net/lzding/article/details/45437707
通过 3 张图和 1 张表格，轻松区别 JavaScript Event 对象中的offsetX, clientX, pageX, screenX, layerX, x等属性。
一、测试代码如下：
- <!DOCTYPE HTML>
- <html lang="zh-cn">
- <head>
- <meta charset="utf-8" />
- <title>Javascript</title>
- <style>
- body{margin:0;padding:0;background:#ccc;font-size:12px;overflow:auto}
- .main{ 500px;height: 330px;position: relative;margin: 250px auto 0;background-color: #eee;}
- .box{position: absolute; 220px;height: 180px;background-color: orange;top: 80px;left: 80px;}
- </style>
- </head>
- <body style="height:1600px;">
- <div class="main">
- <div class="box" id="box"></div>
- </div>
- <script>
- var oBox = document.getElementById('box');
- window.onload = function(){
- oBox.onmousedown = function(ev){
- ev = ev || window.event;
- console.log(ev.offsetX, ev.offsetY);
- console.log(ev.clientX, ev.clientY);
- console.log(ev.pageX, ev.pageY);
- console.log(ev.screenX, ev.screenY);
- console.log(ev.layerX, ev.layerY);
- console.log(ev.x, ev.y);
- }
- }
- </script>
- </body>
- </html>
二、不同浏览器对这些属性的支持：
三、图解 event.offsetX，event.clientX，event.pageX，event.screenX属性
四、图解 event.layerX，event.layerY 属性
五、图解 event.x，event.y 属性
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六、Jquery 兼容写法
jQuery event 事件对象，包含有 event.offsetX， event.clientX，event.pageX，event.screenX等属性（firefox 浏览器中， offsetX 为 undefined）。firefox 获取 offsetX / offsetY 的值，需要通过 event 对象的属性 originalEvent。
- <script>
- $(function(){
- $("#box").mousedown(function(event){
- console.log(event.offsetX, event.offsetY);
- console.log(event.clientX, event.clientY);
- console.log(event.pageX, event.pageY);
- console.log(event.screenX, event.screenY);
- /* firefox */
- console.log(event.originalEvent.layerX, event.originalEvent.layerY);
- });
- });
- </script>