<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>猜拳</title>
</head>
<body>
</body>
<script>
var isRight = false;
var errCount = 0;
var count = 0;
// break 表示跳出整个循环
// continue 表示跳出本次循环，进入下一次循环
while (!isRight) {
var player = Number(prompt("请出拳：剪刀-4 石头-7 布-10"));
console.log(player);
if (player != 4 && player != 7 && player != 10) {
errCount++;
alert("你错了"+errCount+"次，小心了！");
if (errCount >= 3) {
break;
} else {
continue;
}
}
count++;
// Math.random()是一个求0-1随机小数的数学函数
// Math.random()*3是0-3的小数
// parseInt(Math.random()*3)取0 1 2三个整数
var npc = parseInt(Math.random()*3);
console.log(npc);
var result = player + npc;
switch (result) {
case 4:
case 8:
case 12:
alert("平，继续努力！");
break;
case 5:
case 9:
case 10:
alert("输，请剁手！");
break;
case 6:
case 7:
case 11:
alert("您共计用了"+count+"次，终于战胜了电脑，然并卵！");
isRight = true;
break;
}
}
</script>
</html>