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在这个我似乎无法找到的错误中，我正在读取一个名为 db.json 的 .json 文件，更新 json 并尝试写入 .json 文件。虽然我正在解析和字符串化 json，但我收到了这个错误：

SyntaxError：/Users/3x7r3m157/Development/Javascript/db.json：JSON 输入意外结束

我的代码如下：

const args = require('yargs').argv;
const fs = require('fs');
const util = require('util');
const leaderboard = require('./db.json')

const addCompetitor = (name) => {
  leaderboard[name] = { points: [], times: [] }
  console.log(leaderboard)
  return leaderboard
}

console.log(leaderboard)

const addCompetitorTimes = (data) => {
  console.log(data)
  //this method takes a string of 'competitorName_time'
  //parses it into substrings 'name' & 'time'.

  //Afterwards it iterates through time in minutes and seconds as a string
  //in the format of '00:00', then parses the string into substrings
  //of minutes and seconds delimited by the ':' character.
  //Thereafter it converts the string to integeters and converts the time
  //into time in seconds for easy comparison of times.

  //Finally it assigns the time to the competitor in the leaderboard and
  //writes to json file db.json

  let parser = 0;
  var competitor = '';
  let times = '';
  let seconds = '';
  let minutes = '';
  let timeInSeconds = 0;

  for (let i = 0 ; i < data.length ; i ++) {
    if (parser == 0 && data[i] == '_') {
      parser ++
      continue
    }
    if (parser == 0) {
      //Stack Overflow peeps, weird error right hurrr:
      competitor += data[i]
    }
    if (parser == 1) {
      times += data[i]
    }
  }

  parser = 0

  for (let i = 0 ; i < times.length ; i ++) {
    if (parser == 0 && times[i] == ':') {
      parser ++
      continue
    }
    if (parser == 0) {
      minutes += times[i]
    }
    if (parser == 1) {
      seconds += times[i]
    }
  }

  seconds = parseInt(seconds);
  minutes = parseInt(minutes);

  let minutesInSeconds = minutes * 60

  seconds = minutesInSeconds + seconds
  leaderboard[competitor].times = seconds

  console.log(leaderboard)

  fs.writeFileSync('./db.json', JSON.stringify(leaderboard));

  return leaderboard
}

addCompetitorTimes(args.competitorTimes)

db.json：

{"Atlas":{"points":0,"times":0}}

完整堆栈跟踪错误：

internal/modules/cjs/loader.js:800
    throw err;
    ^

SyntaxError: /Users/3x7r3m157/Development/Javascript/db.json: Unexpected end of JSON input
    at JSON.parse (<anonymous>)
    at Object.Module._extensions..json (internal/modules/cjs/loader.js:797:27)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (internal/modules/cjs/helpers.js:25:18)
    at Object.<anonymous> (/Users/3x7r3m157/Development/Javascript/leaderboard.js:4:21)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
4

2 回答 2

1

问题是“require”会为您解析 json，但您使用 json.parse 对其进行了冗余解析。它已经是一个对象，但失败了。只是不要双重解析。要求就够了。

于 2019-10-13T13:49:00.580 回答
0

您正在编辑仍在阅读的文件。首先更改路径的名称，我建议在使用 JSON 或读/写文件时始终使用 try catch：

  try {
   fs.writeFileSync(require.resolve('./new-db.json')), JSON.stringify(leaderboard));    
  } catch (error) {
    console.log(error)
  }
于 2019-10-13T14:30:42.360 回答