提示JavaScript如果还有别的意外令牌 [英] Prompt JavaScript If Else Unexpected Token else

问题描述

我正在使用Code Academy自学JavaScript，我正在尝试制作一些简单的代码，以便在提示问题时，用户回复会给出回复。

I'm teaching myself JavaScript using Code Academy and I'm trying to make some simple code so that when prompt asks a question, the user reply gives a response.

示例。

prompt says "what's your favourite colour?"

user says "blue"

response "that's the same colour as the sky!"

但是当我尝试添加不同的选项时，我收到语法错误：意外的令牌。

But when I try to add different options, I get Syntax error: unexpected token else.

我试过这样做，如果我问了一个问题，答案会收到回复，但其他任何内容都会得到答复。

I tried making it so that if I asked a question, the reply gets a response but anything else gets a response.

这是代码。

prompt("what do you want?");

if ("coke");
{console.log ("no coke, pepsi.")};
else
console.log ("pepsi only.")};

如果有人有任何想法，我将非常感激！

If anyone has any ideas, I'd be very grateful!

推荐答案

免责声明：我不为可口可乐工作。

Disclaimer: I don't work for Coca Cola.

您需要保存返回值提示符如果您想稍后使用它。此外，您还有一些应该纠正的语法错误：

You need to save the return value of prompt if you want to use it later. Also, you have some syntax errors that should be corrected:

var answer = prompt('what do you want?');

if (answer === 'coke') {
    console.log('you said coke!');
} else {
    console.log('why didn\'t you say coke!?');
}

您可以在获得更多案件时使用开关：

You could also use a switch as you get more cases:

var answer = prompt('what do you want?');

switch (answer) {
    case 'coke':
        console.log('you said coke!');
        break;
    default:
        console.log('why didn\'t you say coke!?');
        break;
}

或者一个对象，因为大多数人都喜欢这样切换：

Or an object, as most people prefer this to switch:

var answer = prompt('what do you want?');

var responses = {
    coke: 'you said coke!',
    defaultResponse: 'why didn\'t you say coke!?'
};

console.log(responses[answer] || responses.defaultResponse);

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