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1 <!DOCTYPE html>
2 <html>
3 <head>
4 <meta charset="UTF-8">
5 <title>矩形碰撞01</title>
6 <style type="text/css">
7 * { margin: 0; padding: 0; }
8 div { position: absolute; width: 100px; height: 100px; font-size: 50px; line-height: 100px; text-align: center; }
9 #move_box { background-color: #40E0D0; cursor: pointer; }
10 #hit_box { left: 200px; top: 200px; background-color: #98FB98; }
11 </style>
12 </head>
13 <body>
14 <div id="move_box">移动</div>
15 <div id="hit_box">被撞</div>
16 </body>
17 <script type="text/javascript">
18
19 var moveBox = document.getElementById("move_box");
20 var hitBox = document.getElementById("hit_box");
21
22 //移动对象去进行碰撞
23 moveBox.onmousedown = function (event){
24
25 var event = event || window.event;
26
27 var disX = event.clientX - moveBox.offsetLeft;
28 var disY = event.clientY - moveBox.offsetTop;
29
30 document.onmousemove = function (event){
31
32 var event = event || window.event;
33
34 var x = event.clientX - disX;
35 var y = event.clientY - disY;
36
37 var moveLeft = moveBox.offsetLeft; //移动对象的左偏移
38 var moveRight = moveLeft + moveBox.offsetWidth; //移动对象的右偏移=左偏移+自身宽度
39 var moveTop = moveBox.offsetTop; //移动对象的上偏移
40 var moveBottom = moveTop + moveBox.offsetHeight; //移动对象的下偏移=上偏移+自身高度
41
42 var hitLeft = hitBox.offsetLeft; //被撞对象的左偏移
43 var hitRight = hitLeft + hitBox.offsetWidth;
44 var hitTop = hitBox.offsetTop;
45 var hitBottom = hitTop + hitBox.offsetHeight;
46
47 if (moveBottom < hitTop || moveRight < hitLeft || moveTop > hitBottom || moveLeft > hitRight){
48 hitBox.style.backgroundColor = "#98FB98";
49 hitBox.innerHTML = "被撞";
50 }else{
51 hitBox.style.backgroundColor = "#FF6347";
52 hitBox.innerHTML = "撞上";
53 }
54
55 moveBox.style.left = x + "px";
56 moveBox.style.top = y + "px";
57 }
58
59 //停止移动
60 document.onmouseup = function (){
61 document.onmousemove = null;
62 }
63
64 return false;
65 }
66 </script>
67 </html>
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原文地址：http://www.cnblogs.com/PowellZhao/p/5793842.html
