我为我的网页设计类&分配了一个基本代码,我们需要修改它来做更多事情。只要我添加一个if,else if语句,javascript就停止工作。我无法弄清楚我要去哪里错了。如果有人能引导我走向正确的方向,我会非常感激。 这里的原代码(用音符一个是我们需要做的):添加if-else语句会导致JavaScript停止工作
<!DOCTYPE html>
<!-- Finish the logic of the Rock Paper Scissors game below.
See the comments for instructions. -->
<html>
<head>
<title>RPS</title>
<script>
function rps() {
userChoice = prompt("Rock, paper or scissors?");
userPick.innerHTML = userChoice;
computerChoice = Math.random();
if (computerChoice < 0.34) {
computerChoice = "rock";
} else if (computerChoice < 0.67) {
computerChoice = "paper";
} else {
computerChoice = "scissors";
}
computerPick.innerHTML = computerChoice;
result = compare(userChoice, computerChoice);
if (result == 1) {
// set the outcome entity to say that "Player Wins!"
// also increment the user's score.
} else if (result == -1) {
// set the outcome entity to say that "Computer Wins!"
// also increment the computer's score.
} else {
// set the outcome entity to say "Tie"
}
}
function compare(choice1, choice2) {
// return 0 if choices are equal,
// 1 if choice1 wins,
// -1 if choice2 wins
}
</script>
</head>
<body>
<h2>RockPaperScissors</h2>
<p id="outcome">-</p> <b> computer picks: </b>
<p id="computerPick">-</p> <b> player picks: </b>
<p id="userPick">-</p>
<!-- create p blocks to store the computer's score (number of wins)
and the user's score. These will have to be modified by the rps function
-->
<button type="button" onclick="rps()">Go</button>
</body>
</html>
这是我改变了功能比较方法:
function compare(choice1, choice2) {
// return 0 if choices are equal,
// 1 if choice1 wins,
// -1 if choice2 wins
if (choice1 == "paper" && choice2 == "rock" ||
choice1 == "rock" && choice2 == "scissors" ||
choice1 == "scissors" && choice2 == "paper") {
return == 1;
}
else if (choice1 == "paper" && choice2 == "scissors" ||
choice1 == "rock" && choice2 == "paper" ||
choice1 == "scissors" && choice2 == "rock") {
return == -1;
}
else {
return == 0;
}
}
@Samuel刘氏:请阅读作业标签维基。不要将它添加到新问题中。 – Mat 2013-03-08 05:25:15