增加了一个判断程序就乱了。该如何处理 _JavaScript

增加了一个判断程序就乱了。。。

HTML code


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
        <title>stone scissors cloth</title>
        <script type="text/javascript" src="js/stone scissors cloth.js"></script>
        <link rel="stylesheet" type="text/css" href="css/stone scissors cloth.css" />
    </head>
    <body>
        <select id="choose">
            <option value="">请选择</option>
            <option value="0">石头</option>
            <option value="1">剪刀</option>
            <option value="2">布</option>
        </select>
        <img id="choosePreview" src=""></img>
        <input type="button" value="确定" id="choosed" />
        <input type="button" value="再来一局" id="chooseAgain" />
        <img id="youChoosed" src=""></img>
        <img id="cpuChoosed" src=""></img>
        <h1 id="result"></h1>
    </body>
</html>

JScript code


/**
 * @author Administrator
 */
var myArr=new Array("img/stone.png","img/scissors.png","img/cloth.png")

window.onload=function()
{
    var choose=document.getElementById("choose");
    choose.selectedIndex=0;
    choose.onclick=choosePreview;
    document.getElementById("chooseAgain").onclick=chooseAgain;
}
//玩家选择预览
function choosePreview()
{
    var choosePreview=document.getElementById("choosePreview");
    choosePreview.src=myArr[this.value];
    document.getElementById("choosed").onclick=choosed;
}
//确定按钮以及游戏结果
function choosed()
{
    document.getElementById("youChoosed").src=document.getElementById("choosePreview").src;
    do
    {
        document.getElementById("cpuChoosed").src=myArr[Math.floor(Math.random()*3)];
    }
    while(document.getElementById("youChoosed").src==document.getElementById("cpuChoosed").src)
    if(document.getElementById("youChoosed").src=myArr[0])
    {
        if(document.getElementById("cpuChoosed").src=myArr[1])
        {
            document.getElementById("result").innerHTML="You win!";
        }
        else
        {
            document.getElementById("result").innerHTML="You lost!";
        }
    }
    else if(document.getElementById("youChoosed").src=myArr[1])
    {
        if(document.getElementById("cpuChoosed").src=myArr[0])
        {
            document.getElementById("result").innerHTML="You lost!";
        }
        else
        {
            document.getElementById("result").innerHTML="You win!";
        }
    }
    else if(document.getElementById("youChoosed").src=myArr[2])
    {
        if(document.getElementById("cpuChoosed").src=myArr[0])
        {
            document.getElementById("result").innerHTML="You win!";
        }
        else
        {
            document.getElementById("result").innerHTML="You lost!";
        }
    }
}
//清空画面 再来一局
function chooseAgain()
{
    document.getElementById("choose").selectedIndex=0;
    document.getElementById("choosePreview").src="";
    document.getElementById("youChoosed").src="";
    document.getElementById("cpuChoosed").src="";
}