es6为类创建多个构造函数

虽然ES6之后可以实现JavaScript创建Class，但自身并不提供函数重载，所以无法直接创建多个构造函数

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解决

1. 原理则是对一个构造函数的传值进行类型判断，从而实现根据类型的不同调用不同的构造函数方法体

export default class User { constructor (obj) { if (typeof obj === 'string') { this._constructorSimple(obj) } else if (typeof obj === 'object') { this._constructorComplex(obj) } } _constructorSimple (id) { this.id = id this.code = '' this.name = '' this.sex = '男' this.age = 20 this.birthday = '' this.address = '' this.selectedGroup = [] this.selectedRoles = [] } _constructorComplex (data) { this.id = data.id this.code = data.code this.name = data.name this.sex = data.sex this.age = data.age this.birthday = data.birthday this.address = data.address this.selectedGroup = data.groupIds.split(',') this.selectedRoles = data.selectedRoles } }