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/* 页面引入该js后使用
 * compare(userChoice,computerChoice);
 * 来触发函数.
 */
var userChoice=prompt("Do you choose rock, paper or scissors?");
var computerChoice=Math.random();
if(0<=computerChoice<=0.33)
{
    computerChoice="rock";
}
else if(0.34<=computerChoice<=0.66)
{
    computerChoice="paper";
}
else if(0.67<=computerChoice<=1)
{
    computerChoice="scissors";
}
else
{
    alert("Some Error!");
}
 
var compare=function(choice1,choice2)
{
    if(choice1===choice2)
    {
        alert("The result is a tie!");
    }
    else if(choice1==="rock")
    {
        if(choice2==="scissors")
        {
            alert("rock wins");
        }
        else
        {
            alert("paper wins");
        }
    }
    else if(choice1==="paper")
    {
        if(choice2==="rock")
        {
            alert("paper wins");
        }
        else
        {
            alert("scissors wins");
        }
    }
    else if(choice1==="scissors")
    {
        if(choice2==="rock")
        {
            alert("rock wins");
        }
        else
        {
            alert("scissors wins");
        }
    }
    else
    {
        alert("Some Error!");
    }
}