5.js模式-职责链模式

1. 职责链模式

将对象连成一条链，并沿着这条链传递请求，直到有一个对象处理它为止。

var chain = function(fn){

this.fn = fn;

this.successor = null;

}

chain.prototype.setNextSuccessor = function(successor){

return this.successor = successor;

}

chain.prototype.passRequest = function(){

var ret = this.fn.apply(this,arguments);

if(ret === 'nextSuccessor'){

return this.successor && this.successor.passRequest .apply(this.successor,arguments);

}

return ret;

}

var order200 = function(pay){

if(pay){

console.log('200');

}else{

return 'nextSuccessor';

}

}

var normal = function(pay){

if(pay){

console.log('10');

}else{

console.log('50');

}

}

var chain200 = new chain(order200);

var chainNormal = new chain(normal);

• order200.setNextSuccessor(chainNormal);

chain200.passRequest(false);