ReferenceError: prompt is undefined. How would I fix this in JavaScript?

Question

我正在使用 JavaScript 创建的这家餐厅中创建不同的餐点菜单。当我遇到这个 ReferenceError 说提示未定义时，我正在添加代码的前几行。如果您需要查看完整上下文，可以在此处参考原始代码 https://repl.it/@qwerty_________/Welcome-to-the-Drivethrough and the code I'm working on here https://repl.it/@qwerty_________/DullFreeMisrac。官方报错就在这里

ReferenceError: prompt is not defined
at evalmachine.<anonymous>:2:12
at Script.runInContext (vm.js:74:29)
at Object.runInContext (vm.js:182:6)
at evaluate (/run_dir/repl.js:133:14)
at ReadStream.<anonymous> (/run_dir/repl.js:116:5)
at ReadStream.emit (events.js:180:13)
at addChunk (_stream_readable.js:274:12)
at readableAddChunk (_stream_readable.js:261:11)
at ReadStream.Readable.push (_stream_readable.js:218:10)
at fs.read (fs.js:2124:12)

这是在 JavaScript 上进行的。我已经尝试将其更改为 window.prompt 而不是提示，它说 window 未定义。

 var nam = prompt("Hi, Welcome to the Drivethrough!! What is your name?")
 var mprice = 4
 var bprice = 8
 var cprice = 6
 var fprice = 2
 var oprice = 3
 var fmprice = 5
 var gprice = 0
 var price = 0
 var fcmprice = 10
 var cmprice = 4
 var kkkprice = 9
 var dddprice = 10
 var mmmprice = 12
 var icprice = 6
 var resprice = 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
 var superprice = 1

我原以为它会弹出一个弹出框询问我的名字然后我 select 早餐菜单来测试巧克力牛奶，但它却弹出错误代码告诉我提示是不明确的。

非常感谢您查看我的问题。 :)

Answer 1

prompt() is a method of the Global window object found in browsers. It's not part of the JavaScript language. If you don't run your code in a browser or an environment that supports the Browser Object Model、window 不会存在，如果 window 不存在，prompt() 也不会存在。运行您在浏览器中的代码。

Answer 2

看来您运行此代码在 Node.js 环境中，在提供此环境的站点中。 window 对象未在此环境中定义。您可以尝试在浏览器控制台或 HTML 文件中测试您的脚本。

ReferenceError: prompt is undefined. How would I fix this in JavaScript?

ReferenceError: prompt is undefined. How would I fix this in JavaScript?

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