js实现打地鼠小游戏

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话不多说，请看代码：

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>打地鼠</title>
 <style type="text/css">
 #content {
 width:960px;
 margin:0 auto;
 text-align:center;
 margin-top:40px;
 }
 #form1 {
 margin:20px 0;
 }
 table {
 margin:0 auto;
 cursor:url(http://cdn.attach.qdfuns.com/notes/pics/201702/12/115915n79d7hvffengpdxe.png),auto;
 }
 td {
 width:95px;
 height:95px;
 background:#00ff33;
 }
 </style>
 <script type="text/javascript">
 var td = new Array(),  //保存每个格子的地鼠
 playing = false,  //游戏是否开始
 score = 0, //分数
 beat = 0, //鼠标点击次数
 success = 0, //命中率
 knock = 0, //鼠标点中老鼠图片的次数
 countDown = 30, //倒计时
 interId = null, //指定 setInterval()的变量
 timeId = null; //指定 setTimeout()的变量
 //游戏结束
 function GameOver(){
 timeStop();
 playing = false;
  clearMouse();
 alert("游戏结束！\n 你获得的分数为："+score+"\n 命中率为："+success);
 success = 0;
 score = 0;
 knock = 0;
 beat = 0;
 countDown = 30;
 }
 //显示当前倒计时所剩时间
 function timeShow(){
 document.form1.remtime.value = countDown;
 if(countDown == 0){
 GameOver();
 return;
 }else{
 countDown = countDown-1;
 timeId = setTimeout("timeShow()",1000);
 }
 }
 //主动停止所有计时
 function timeStop() {
 clearInterval(interId);
 clearTimeout(timeId); 
 }
 //随机循环显示老鼠图片
 function show(){
 if(playing){
 var current = Math.floor(Math.random()*25);
 document.getElementById("td["+current+"]").innerHTML = '<img src="http://cdn.attach.qdfuns.com/notes/pics/201702/12/115915w6tluu1gq8l1b54h.png">';
 setTimeout("document.getElementById('td["+current+"]').innerHtml=''",3000); //使用 setTimeout()实现3秒后隐藏老鼠图片
 }
 }
 //清除所有老鼠图片
 function clearMouse(){
 for(var i=0;i<25;i++){
 document.getElementById("td["+i+"]").innerHTML="";
 }
 }
 //点击事件函数，判断是否点中老鼠
 function hit(id){
 if(playing == false){
 alert("请点击开始游戏!");
 return;
 }else{
 beat += 1;
 if(document.getElementById("td["+id+"]").innerHTML != ""){
 score += 1;
 knock += 1;
 success = knock/beat;
 document.form1.success.value = success;
 document.form1.score.value = score;
 document.getElementById("td["+id+"]").innerHTML = "";
 }else{
 score += -1;
 success = knock/beat;
 document.form1.success.value = success;
  document.form1.score.value = score;
 }
 }
 }
 //游戏开始
 function GameStart(){
 playing = true;
 interId = setInterval("show()",1000); 
 document.form1.score.value = score;
 document.form1.success.value = success;
 timeShow();
 } 
 </script>
</head>
<body>
 <div id="content">
 <input type="button" value="开始游戏" onclick="GameStart()" />
 <input type="button" value="结束游戏" onclick="GameOver()" />
 <form name="form1" id="form1">
  <label>分数：</label>
  <input type="text" name="score" size="5">
  <label>命中率：</label>
  <input type="text" name="success" size="10">
  <label>倒计时：</label>
  <input type="text" name="remtime" size="5">
 </form> 
 <table>
  <tr>
  <td id="td[0]" onclick="hit(0)"></td>  
  <td id="td[1]" onclick="hit(1)"></td>
  <td id="td[2]" onclick="hit(2)"></td>
  <td id="td[3]" onclick="hit(3)"></td>
  <td id="td[4]" onclick="hit(4)"></td>
  </tr>
  <tr>
  <td id="td[5]" onclick="hit(5)"></td>
  <td id="td[6]" onclick="hit(6)"></td>
  <td id="td[7]" onclick="hit(7)"></td>
  <td id="td[8]" onclick="hit(8)"></td>
  <td id="td[9]" onclick="hit(9)"></td>
  </tr>
  <tr>
  <td id="td[10]" onclick="hit(10)"></td>
  <td id="td[11]" onclick="hit(11)"></td>
  <td id="td[12]" onclick="hit(12)"></td>
  <td id="td[13]" onclick="hit(13)"></td>
  <td id="td[14]" onclick="hit(14)"></td>
  </tr>
  <tr>
  <td id="td[15]" onclick="hit(15)"></td>
  <td id="td[16]" onclick="hit(16)"></td>
  <td id="td[17]" onclick="hit(17)"></td>
  <td id="td[18]" onclick="hit(18)"></td>
  <td id="td[19]" onclick="hit(19)"></td>
  </tr>
  <tr>
  <td id="td[20]" onclick="hit(20)"></td>
  <td id="td[21]" onclick="hit(21)"></td>
  <td id="td[22]" onclick="hit(22)"></td>
  <td id="td[23]" onclick="hit(23)"></td>
  <td id="td[24]" onclick="hit(24)"></td>
  </tr>
 </table>
 </div>
</body>
</html>

流程设计：