https://developers.weixin.qq.com/doc/offiaccount/Basic_Information/Access_Overview.html

按照文档指引，服务端 log 日志，编写以下测试代码，test 函数返回 true，但是公众号校验总是提示 token 验证失败：

// node.js

const crypto = require('crypto')

function test () {
  var signature = 'xxx'
  var timestamp = 'xxx'
  var nonce = 'xxx'
   
  var arr = ['xxxx'/* token */, timestamp, nonce]

  arr.sort()

  var str = calculateSHA1(arr.join(''))

  return str === signature
}

console.log(test()) // 这里返回是 true，但是微信公众号后台提示校验失败

function calculateSHA1 (input) {  
  const hash = crypto.createHash('sha1'); 
  hash.update(input)
  return hash.digest('hex')
}