Question

我不断收到“SyntaxError：Unexpected关键字'else'”的错误。任何人都可以帮我解释为什么这是？

// Check if the user is ready to play!
confirm("I am ready to play!");
var age = prompt("What's your age?");
if(age === 13)
{
console.log("You are allowed to play but at your own risk.");
}
else
{
console.log("Play on!");
}
console.log("You are at a Justin Bieber concert, and you hear this 
lyric      'Lace my shoes off, start racing.'");
console.log("Suddenly, Bieber stops and says, 'Who wants to race me?'");
var userAnswer = prompt("Do you want to race Bieber on stage?");
if(userAnswer === "yes")
{
console.log("You and Bieber start racing. It's neck and neck! 
You win by   a shoelace!");
}
else(userAnswer === "no")
{
console.log("Oh no! Bieber shakes his head and sings 'I set a pace, 
so I can race without pacing.'");
}
var feedback = prompt("Rate Game 1-10");
if(feedback > 8)
{
console.log("Thank you! We should race at the next concert!");
else(feedback < 8)
{
console.log("I'll keep practicing coding and racing.");

我不断收到“SyntaxError：Unexpected关键字'else'”的错误。任何人都可以帮我解释为什么这是？

Answer 1

看到这段代码？

if(feedback > 8)
{
console.log("Thank you! We should race at the next concert!");
else(feedback < 8)
{

应该是：

if(feedback > 8)
{
console.log("Thank you! We should race at the next concert!");
}
else(feedback < 8)
{

您错过了}。另外，请注意T.J.的评论。 else没有条件，所以它应该是：

if(feedback > 8)
{
console.log("Thank you! We should race at the next concert!");
}
else
{

如果这是它在代码中的存在方式，则以下问题也存在问题，但我将假设它是一个复制/粘贴问题。除非你将其转义，否则不能将这样的字符串拆分为多行。

console.log("You are at a Justin Bieber concert, and you hear this 
lyric      'Lace my shoes off, start racing.'");

Answer 2

一些观察结果：

else没有条件，所以像
这样的行
```
else(userAnswer === "no")
```
不要做你认为他们做的事情，这会在以后导致语法错误。代替：
```
else if (userAnswer === "no")
```
您不能只在字符串文字的中间放置换行符，而不是使用"或'引用的字符串。（你可以用ES6的新模板字符串引用```，但到目前为止支持很薄。）
缩进是你的朋友。用它。 http://jsbeautifier.org或任何一半体面的IDE都可以提供帮助。

...并查看Andy's answer关于遗失}的内容，如果您使用缩进（上面的＃3），这将更加明显。

Answer 3

你的js中缺少关闭}

if(feedback > 8)
{
console.log("Thank you! We should race at the next concert!");
else(feedback < 8)
{
console.log("I'll keep practicing coding and racing.");

更正后的代码

if(feedback > 8)
{
console.log("Thank you! We should race at the next concert!");
}
else(feedback < 8)
{
console.log("I'll keep practicing coding and racing.");
}

如果语句出现Var Prompt

3 个答案: