如何用JavaScript获取鼠标点击时在canvas画布上的坐标呢：
代码如下：
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1 <!DOCTYPE html>
2 <html lang="en">
3 <head>
4 <meta charset="UTF-8">
5 <title>demo</title>
6 <style type="text/css">
7 *{
8 margin:0;
9 padding:0;
10 }
11 #canvas{
12 background:green;
13 width:100%;
14 height:100%;
15 }
16 body,html{
17 overflow:hidden;
18 width:100%;
19 height:100%;
20 }
21 </style>
22 <script type="text/javascript">
23 window.onload = function(){
24
25 var canvas = document.getElementById('canvas'); //获取画布;
26
27 var utils = {}; //创建空对象;
28 canvas.style.height = document.body.clientHeight; //设置全屏高度;
29 utils.captureMouse = function(canvas){ //添加方法;
30 var mouse = {x:0,y:0}; //初始化坐标位置;
31 canvas.addEventListener('mousemove',function(event){ //添加点击监听事件
32 var x,y;
33 if(event.pageX || event.pageY){
34 x = event.pageX;
35 y = event.pageY;
36 }else{
37 x = event.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
38 y = event.clientY + document.body.scrollTop + document.documentElement.scrollTop;
39 }
40 x -= canvas.offsetLeft;
41 y -= canvas.offsetTop;
42
43 mouse.x = x; //获取x轴坐标;
44 mouse.y = y; //获取Y轴坐标;
45 },false)
46 return mouse; //返回坐标;
47 };
48
49 mouse = utils.captureMouse(canvas); //实例化对象，传入参数;
50
51 canvas.addEventListener('click',function(){
52 alert("x: " + mouse.x + ", y: " + mouse.y); //弹出坐标;
53 },false);
54 };
55 </script>
56 </head>
57 <body>
58 <canvas id="canvas"></canvas> //创建canvas画布;
59 </body>
60 </html>
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上面就是获取canvas画布上的坐标值了，将它封装起来，
放到单独的js文件中，需要用的时候再引入进去，就是一
个很好的工具了
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