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适用场景：一个完整的流程，中间分成多个环节，各个环节之间存在一定的顺序关系，同时中间的环节的个数不一定，可能添加环节，也可能减少环节，只要保证顺序关系就可以。
如下图：

1. ES5写法

const Chain = function (fn) {this.fn = fnthis.nextChain = nullthis.setNext = function (nextChain) {this.nextChain = nextChainreturn this.nextChain}this.run = function () {this.fn()this.nextChain && this.nextChain.run()}
}
//申请设备
const applyDevice = function () {console.log(111)
}
const chainApplyDevice = new Chain(applyDevice);
//选择收货地址
const selectAddress = function () {console.log(222)
}
const chainSelectAddress = new Chain(selectAddress);
//选择审核人
const selectChecker = function () {console.log(333)
}
const chainSelectChecker = new Chain(selectChecker);chainApplyDevice.setNext(chainSelectAddress).setNext(chainSelectChecker);
chainApplyDevice.run(); //最后执行结果为111-222-333

2. ES6写法

class Chain {constructor(fn) {this.fn = fnthis.nextChain = null}setNext (nextChain) {this.nextChain = nextChainreturn this.nextChain}run() {this.fn()this.nextChain && this.nextChain.run()}
}
//申请设备
const applyDevice = function () {console.log(111)
}
const chainApplyDevice = new Chain(applyDevice);
//选择收货地址
const selectAddress = function () {console.log(222)
}
const chainSelectAddress = new Chain(selectAddress);
//选择审核人
const selectChecker = function () {console.log(333)
}
const chainSelectChecker = new Chain(selectChecker);chainApplyDevice.setNext(chainSelectAddress).setNext(chainSelectChecker);
chainApplyDevice.run(); //最后执行结果为111-222-333