如何修复“词法声明不能出现在单语句上下文中”

Question

当我进行嵌入并运行机器人时，这里出现问题，因为我使用了let EmbedHelp = Discord.RichEmbed此问题出现在终端中，请输入问题以及我需要修复的内容：

SyntaxError: Lexical declaration cannot appear in a single-statement context
   at new Script (vm.js:79:7)
   at createScript (vm.js:251:10)
   at Object.runInThisContext (vm.js:303:10)
   at Module._compile (internal/modules/cjs/loader.js:657:28)
   at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
   at Module.load (internal/modules/cjs/loader.js:599:32)
   at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
   at Function.Module._load (internal/modules/cjs/loader.js:530:3)
   at Function.Module.runMain (internal/modules/cjs/loader.js:742:12)
   at startup (internal/bootstrap/node.js:283:19) 

我用于嵌入的代码是：

client.on('message', message => {
    if (message.startsWith('$Commands'))

    let EmbedHelp = Discord.RichEmbed()
        "title": "title ~~(did you know you can have markdown here too?)~~",
        "description": "```",
        "url": "https://discordapp.com",
        "color": 192748,
        "timestamp": "Timezone - GGT 3+",
        "footer": {
            "icon_url": "https://cdn.discordapp.com/avatars/563449221701959700/8386d5fe48d71898c40244e7a5a66d58.png",
            "text": "footer text"
        },
        "thumbnail": {
            "url": "https://cdn.discordapp.com/avatars/563449221701959700/8386d5fe48d71898c40244e7a5a66d58.png"
        },
        "image": {
            "url": "https://cdn.discordapp.com/embed/avatars/0.png"
        },
        "author": {
            "name": "Galak$y#3038",
            "url": "https://discordapp.com",
            "icon_url": "https://discordapp.com/channels/564059839320555540/569179399211974666"
        },

    }
});
channel.send({EmbedHelp})

Answer 1

该错误指的是下面的行Discord.RichEmbed()。您有一个对象属性声明，但看不到任何对象。看起来你混淆了一些你试图从 Discord 文档中提取的内容。

RichEmbed旨在与其他辅助方法链接。如果您将代码放入一个对象中（将其用大括号括起来{}）并将其传递给一个send方法，它应该会消除该错误。

client.on('message', (message) => {
  if (message.startsWith('$Commands')) {
    message.channel.send({
      embed: {
        title: 'title ~~(did you know you can have markdown here too?)~~',
        description: '```',
        url: 'https://discordapp.com',
        color: 192748,
        timestamp: 'Timezone - GGT 3+',
        footer: {
          icon_url:
            'https://cdn.discordapp.com/avatars/563449221701959700/8386d5fe48d71898c40244e7a5a66d58.png',
          text: 'footer text',
        },
        thumbnail: {
          url: 'https://cdn.discordapp.com/avatars/563449221701959700/8386d5fe48d71898c40244e7a5a66d58.png',
        },
        image: {
          url: 'https://cdn.discordapp.com/embed/avatars/0.png',
        },
        author: {
          name: 'Galak$y#3038',
          url: 'https://discordapp.com',
          icon_url:
            'https://discordapp.com/channels/564059839320555540/569179399211974666',
        },
      },
    });
  }
});

Answer 2

我有以下代码：

                let viewShareSelectBoxInitializedInterval = setInterval(function () {
                    if (IsViewShareSelectBoxInitialized() === true) {
                        clearInterval(viewShareSelectBoxInitializedInterval);
                        ReloadViewShareItems(endItemStateIdForSharing);
                    }
                }, 250);  

我将其更改let为var然后它工作正常。

在我的本地开发机器上，它可以与 一起使用let，但是当 JavaScript 与 using 捆绑在一起时，let它就会失败。