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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。
<!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{width: 500px;height: 330px;position: relative;margin: 250px auto 0;background-color: #eee;} .box{position: absolute;width: 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>
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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>
图解Js event对象offsetX, clientX, pageX, screenX, layerX, x区别
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原文地址：http://www.cnblogs.com/qianduanjingying/p/5842678.html
