使用nodejs将多个复选框选择插入Mysql

我在mysql中插入多个选项时遇到问题。我只能选择一个值，它将被插入到“Weekend”表中，但当我选择多个日期时，它会出错。我不知道如何将输入放入数组并将其插入mysql。感谢您的指导！ passport.js

var LocalStrategy = require("passport-local").Strategy;
var mysql = require('mysql');
var bcrypt = require('bcrypt-nodejs');
var dbconfig = require('./database');
var connection = mysql.createConnection(dbconfig.connection);
connection.query('USE ' + dbconfig.database);
module.exports = function(passport) {
 passport.serializeUser(function(user, done){
  done(null, user.id);
 });

 passport.deserializeUser(function(id, done){
  connection.query("SELECT * FROM users WHERE id = ? ", [id],
   function(err, rows){
    done(err, rows[0]);
   });
 });

 passport.use(
  'local-signup',
  new LocalStrategy({
   firstNameField: 'firstName', 
   lastNameField: 'lastName',
   passReqToCallback: true
  },
  function(req, firstName, lastName, done){ 
    var Weekdays = req.body.Weekdays;

    var newUserMysql = {
          firstName: firstName,
          lastName: lastName,
          Weekdays: Weekdays,

         };

         var insertQuery = "INSERT INTO users (firstName, lastName, Weekdays) values (?, ?, ?)";

         connection.query(insertQuery, [newUserMysql.firstName,newUserMysql.TXDotContact, newUserMysql.lastName,newUserMysql.Weekdays],
          function(err, rows){
           newUserMysql.id = rows.insertId;

           return done(null, newUserMysql);
          });

  })
 );


};

signup.js

<div class="form-group">
      <label>Weekday(s):
        <div>
          <input type="checkbox" name="Weekdays[]" value="Sunday" /> Sunday<br />
          <input type="checkbox" name="Weekdays[]" value="Monday" /> Monday<br />
          <input type="checkbox" name="Weekdays[]" value="Tuesday" /> Tuesday<br />
          <input type="checkbox" name="Weekdays[]" value="Wednesday" /> Wednesday<br />
          <input type="checkbox" name="Weekdays[]" value="Thursday" /> Thursday<br />
          <input type="checkbox" name="Weekdays[]" value="Friday" /> Friday<br />
          <input type="checkbox" name="Weekdays[]" value="Saturday" /> Saturday<br />
        </div><br />
      </label>
    </div>

工作日:
星期日

星期一

星期二

星期三

星期四

星期五

星期六

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我必须替换var Weekdays=req.body.Weekdays；与下面的内容。控制台正在拾取选择，但我无法将数组插入表中。我必须使用JSON.stringify格式化它

for (var Weekdays in req.body.Weekdays) {
      if (req.body.Weekdays) {
        items = req.body.Weekdays;
        Weekdays = JSON.stringify(items).replace(/]|[[]|"/g, '',)
        // console.log(items);
      }
    }