JavaScript实现猜数小游戏完整实例

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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>js游戏</title>
<script type="text/JavaScript">
 var x=10;
 //x=parseInt(Math.random()*(1000-1))+1;
 for(var i=0;i<10;i++){
 var num=prompt("请输入你猜测的数字","");
 if (num!=null && num!="")
  {
 if(num==x){
  switch(i){
  case 0:
   alert('真神啦，猜对了！');
   i=10;
   break;
  case 1:
   alert('厉害，对啦！');
   i=10;
   break;
  case 2:
   alert('真棒，对啦！');
   i=10;
   break;
  case 3:
   alert('好好，对啦！');
   i=10;
   break;
  case 4:
   alert('不容易，对啦！');
   i=10;
   break;
  case 5:
   alert('将就，对啦！');
   i=10;
   break;
  case 6:
   alert('有点慢，对啦！');
   i=10;
   break;
  case 7:
   alert('下次快点，对啦！');
   i=10;
   break;
  case 8:
   alert('赶上啦，对啦！');
   i=10;
   break;
  case 9:
   alert('最后机会，对啦！');
   i=10;
   break;
  }
 }
 if(i==9){
  alert('笨蛋，10次都猜不对！');
 }
 if(num>x){
  document.write("您已经猜了" + eval(i+1) + "次," + num +"," + "大了！<br>");
 }
 if(num<x){
  document.write("您已经猜了" + eval(i+1) + "次," + num +"," + "小了！<br>");
 }
  }else{
 alert('不能为空'); 
 }
 }
</script>
</head>
<body>
<div id="div1"></div>
</body>
</html>