Question

我正在编写一个Discord机器人，其中的一部分是存储在JSON文件中的对象数组。用户将能够使用不同的命令在阵列中添加和删除对象。数组中的每个对象都有两个属性：{"string":"test","count":0}

我有一些代码可以成功地将对象添加到数组中

let rawdata = fs.readFileSync('config.json');
let blacklist = JSON.parse(rawdata);

var newWord = {"string": args[3], "count": 0}
blacklist.words.push(newWord);

let data = JSON.stringify(blacklist);
fs.writeFileSync('config.json', data);

我还写了一些代码来从数组中删除对象：

var remove = false;
for (i = 0; i < blacklist.words.length; i++) {
  if (blacklist.words[i].string === args[3]) {
    blacklist.words.splice(i, 1);
    var removed = true;
  }
}

if (removed) {
  message.reply(
    "the word `" +
      args[3] +
      "` has been successfully remove from your blacklist!"
  );
} else {
  message.reply(
    "I couldn't find the word `" + args[3] + "` on your blacklist!"
  );
}

问题是，向该数组添加对象的代码运行良好，但是删除对象的代码却无法正常工作。当我发送删除对象的命令时，机器人会用"the word“ + args [3] +” has been successfully remove from your blacklist!"进行回复，这使我认为代码已成功运行，但实际上没有运行。

Answer 1

在您的代码中，removed在for循环内被重新声明。

我还添加了break，因此即使获得结果后您也无需遍历整个数组

var remove = false;
for (i = 0; i < blacklist.words.length; i++) {
    if (blacklist.words[i].string === args[3]) {
        blacklist.words.splice(i, 1);
        removed = true;
        break;
    }
}

if (removed) {
    message.reply("the word `" + args[3] + "` has been successfully remove from your blacklist!");
} else {
    message.reply("I couldn't find the word `" + args[3] + "` on your blacklist!");
}

Answer 2

如果您使用的是ES5，则可以使用过滤器功能

const filteredBlackList = blacklist.words.filter((item) => item.string !== args[3]);

var remove = false;
if (blacklist.words.length !== filteredBlackList.length) {
   remove = true;
}

if (removed) {
  message.reply("the word `" + args[3] + "` has been successfully remove from 
  your blacklist!");
} else {
  message.reply("I couldn't find the word `" + args[3] + "` on your 
  blacklist!");
}

无法拼接对象数组中的项目

2 个答案: