sequelize.define
sequelize.definesequelize.define使用该方法可以定义model，例子如下：
const Sequelize = require('sequelize');

var sequelize = new Sequelize(config.database, config.username, config.password, {
host: config.host,
dialect: 'mysql',
pool: {

max: 5,

min: 0,

idle: 30000
}
});

var Website = sequelize.define('website', {
id: {

type: Sequelize.BIGINT,

primaryKey: true,

autoIncrement: true
},
url: Sequelize.STRING(255),
title: Sequelize.STRING(255),
status: Sequelize.INTEGER,
delete_mark: Sequelize.BOOLEAN
}, {
timestamps: false
});


const Sequelize = require('sequelize');

var sequelize = new Sequelize(config.database, config.username, config.password, {
host: config.host,
dialect: 'mysql',
pool: {

max: 5,

min: 0,

idle: 30000
}
});

var Website = sequelize.define('website', {
id: {

type: Sequelize.BIGINT,

primaryKey: true,

autoIncrement: true
},
url: Sequelize.STRING(255),
title: Sequelize.STRING(255),
status: Sequelize.INTEGER,
delete_mark: Sequelize.BOOLEAN
}, {
timestamps: false
});

该方法传入的第一个参数是数据表的单数形式，怎么理解呢？例如这里传入的是website其实是模型名，数据表默认是websites这样的复数形式，这种约定我在Laravel中也碰见过，也就是常说的，约定大于定义，也就是说，如果我们都按照约定的规范去开发，那么效率其实比重新定义，要高很多。那么，定义好了模型，该怎么进行使用呢？
(async () => {
let demo = await Website.create({

url:'http://www.xxxx.com/',

title:'demo'
});
console.log(demo);
})();

(async () => {
let demo = await Website.create({

url:'http://www.xxxx.com/',

title:'demo'
});
console.log(demo);
})();
继承Model
继承Model
继承Model

const {Sequelize, DataTypes, Model} = require('sequelize');
const config = require('../config');

const sequelize = new Sequelize(config.database, config.username, config.password, {
host: config.host,
dialect: 'mysql',
pool: {

max: 5,

min: 0,

idle: 30000
}
});

/**
* @author chaojilaji
* 数据表websites的关系对象映射
*/
class WebSite extends Model {

}

WebSite.init({
id: {

type: Sequelize.BIGINT,

primaryKey: true,

autoIncrement: true
},
url: Sequelize.STRING(255),
title: Sequelize.STRING(255),
status: Sequelize.INTEGER,
delete_mark: Sequelize.BOOLEAN
}, {
sequelize,
modelName: 'Website',
timestamps:false
});

(async () => {
await sequelize.sync();
let x = await WebSite.create({

url: 'http://www.xxxxxxxx.com/',

title: 'demo2'
});
console.log(x);
})();

module.exports = WebSite;


const {Sequelize, DataTypes, Model} = require('sequelize');
const config = require('../config');

const sequelize = new Sequelize(config.database, config.username, config.password, {
host: config.host,
dialect: 'mysql',
pool: {

max: 5,

min: 0,

idle: 30000
}
});

/**
* @author chaojilaji
* 数据表websites的关系对象映射
*/
class WebSite extends Model {

}

WebSite.init({
id: {

type: Sequelize.BIGINT,

primaryKey: true,

autoIncrement: true
},
url: Sequelize.STRING(255),
title: Sequelize.STRING(255),
status: Sequelize.INTEGER,
delete_mark: Sequelize.BOOLEAN
}, {
sequelize,
modelName: 'Website',
timestamps:false
});

(async () => {
await sequelize.sync();
let x = await WebSite.create({

url: 'http://www.xxxxxxxx.com/',

title: 'demo2'
});
console.log(x);
})();

module.exports = WebSite;

我比较推荐使用继承Model这种方式，通过创建一个class，这样可以使用model.exports=模块名的方式，将该模型封装起来。供别的地方使用，只需要require进去即可。具体如何对数据表进行操作，就比较简单了，只需要参考API即可。 sequelize文档地址sequelize文档地址