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本文来做一个简单的实时获取鼠标坐标的功能，在canvas动画开发中，获取鼠标的坐标，键盘的按键等等，都是常用的操作，我们就慢慢得把他们封装成一个公共库。
一、事件的兼容：
function bindEvent(obj, event, fn) { if (obj.attachEvent) { //ie obj.attachEvent('on' + event, function () { fn.call(obj); }); } else { //chrome&ff obj.addEventListener(event, fn, false); } }登录后复制上面兼容ie8以及修正this关键字在ie低版本的指向，下面兼容chrome和ff。其他更常用的封装可以参考我的javascript开源框架gdom
二、用立即表达式搭建一个基本的库
添加获取鼠标坐标的方法
;(function (window) { window.G = {}; function bindEvent(obj, event, fn) { if (obj.attachEvent) { //ie obj.attachEvent('on' + event, function () { fn.call(obj); }); } else { //chrome&ff obj.addEventListener(event, fn, false); } } G.getPos = function( dom ){ var oPos = { x : 0, y : 0 }; bindEvent( dom, 'mousemove', function( ev ){ var oEvent = ev || event, x, y; if ( oEvent.pageX || oEvent.pageY ){ x = oEvent.pageX; y = oEvent.pageY; }else { x = oEvent.clientX + document.body.scrollLeft || document.documentElement.scrollLeft; y = oEvent.clientX + document.body.scrollTop || document.documentElement.scrollTop; } x -= dom.offsetLeft; y -= dom.offsetTop; oPos.x = x; oPos.y = y; } ); return oPos; };})(window);登录后复制三、引入封装的js库，绑定canvas为监听对象，打印当前鼠标的坐标
鼠标的坐标，我这里画了2根线，便于观察.
<head><meta charset='utf-8' /><script>;(function (window) { window.G = {}; function bindEvent(obj, event, fn) { if (obj.attachEvent) { //ie obj.attachEvent('on' + event, function () { fn.call(obj); }); } else { //chrome&ff obj.addEventListener(event, fn, false); } } G.getPos = function( dom ){ var oPos = { x : 0, y : 0 }; bindEvent( dom, 'mousemove', function( ev ){ var oEvent = ev || event, x, y; if ( oEvent.pageX || oEvent.pageY ){ x = oEvent.pageX; y = oEvent.pageY; }else { x = oEvent.clientX + document.body.scrollLeft || document.documentElement.scrollLeft; y = oEvent.clientX + document.body.scrollTop || document.documentElement.scrollTop; } x -= dom.offsetLeft; y -= dom.offsetTop; oPos.x = x; oPos.y = y; } ); return oPos; };})(window);</script><style>#canvas{ border:1px dashed #aaa;}</style><script>window.onload = function(){ var oCanvas = document.querySelector( "#canvas" ), oGc = oCanvas.getContext( '2d' ), width = oCanvas.width, height = oCanvas.height, oInfo = document.querySelector( "#info" ), oPos = G.getPos( oCanvas ); oCanvas.addEventListener( "mousemove", function(){ oGc.clearRect( 0, 0, width, height ); oGc.beginPath(); oGc.moveTo( oPos.x, 0 ); oGc.lineTo( oPos.x, height ); oGc.moveTo( 0, oPos.y ); oGc.lineTo( width, oPos.y ); oGc.closePath(); oGc.strokeStyle = '#09f'; oGc.stroke(); oInfo.innerHTML = '鼠标的当前坐标是:(' + oPos.x + ',' + oPos.y + ')'; }, false );}</script></head><body><canvas id="canvas" width="500" height="400"></canvas><p id="info"></p></body>登录后复制以上就是如何实时获取鼠标的当前坐标 的详细内容，更多请关注9543建站博客其它相关文章！
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