JS设计模式--单例模式

单例模式在js中的写法，十分简单，话不多说，上代码：

let Store = function (name) {
  this.name = name
}
Store.prototype.getName = function () {
  return this.name
}
Store.getInstance = (function () {
  let instance = null
  return function (name) {
    if (!instance) {
      instance = new Store(name)
    }
    return instance
  }
})()
let store = Store.getInstance('car')
let store2 = Store.getInstance('car2')
console.log(store, store2, store === store2)

透明单例

let Store = (function () {
  let instance = null
  let Store = function (name) {
    if (instance) {
      return instance
    } else {
      this.name = name
      instance = this
      return instance
    }
  }
  Store.prototype.getName = function () {
    return this.name
  }
  return Store
})()
let store1 = new Store('car')
let store2 = new Store('car2')
console.log(store1, store2, store1 === store2)

应用：

1. 模态对话框
2. 方法与组件库