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lilythylilythy
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chain of responsibility pattern
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‎ChainOfResponsibility/chainOfRes.html

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<script>
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var order = function(orderType,pay,stock){
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if(orderType === 1){ // 500 元定金购买模式
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if(pay == true){
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console.log('500 元定金预购, 得到100 优惠券');
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}else{
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if(stock>0){
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console.log('普通购买，无优惠券');
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}else{
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console.log('手机库存不足');
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}
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}
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}
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else if(orderType === 2){ // 200 元定金购买模式
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if(pay === true){
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console.log('200 元定金预购, 得到50 优惠券');
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}else{
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if(stock>0){
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console.log('普通购买，无优惠券');
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}else{
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console.log('手机库存不足');
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}
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}
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}
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else if(orderType === 3){ //普通购买
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if(stock > 0){
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console.log('普通购买，无优惠券');
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}else{
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console.log('手机库存不足');
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}
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}
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};
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order(1,true,500); // 输出： 500 元定金预购, 得到100 优惠券
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</script>
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<script>
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var order500 = function(orderType,pay,stock){
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if(orderType === 1 && pay === true){
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console.log('500 元定金预购, 得到100 优惠券');
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}else{
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order200(orderType,pay,stock);
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}
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};
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// 200 元订单
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var order200 = function(orderType,pay,stock){
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if(orderType === 2 && pay === true){
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console.log('200 元定金预购, 得到50 优惠券');
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}else{
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orderNormal(orderType,pay,stock);
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}
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};
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// 普通购买订单
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var orderNormal = function(orderType,pay,stock){
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if(stock > 0){
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console.log('普通购买，无优惠券');
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}else{
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console.log('手机库存不足');
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}
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};
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//测试结果
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order500(1,true,500); // 输出：500 元定金预购, 得到100 优惠券
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order500(2,true,500); // 输出：200 元定金预购, 得到500 优惠券
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order500(3,false,500); // 输出：普通购买, 无优惠券
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order500(3,false,0); // 输出：手机库存不足
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</script>
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<script>
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var Order500 = function(orderType,pay,stock){
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if(orderType === 1 && pay === true){
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console.log('500 元定金预购，得到100 优惠券');
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}else{
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return 'nextSuccessor';
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}
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};
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var Order200 = function(orderType,pay,stock){
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if(orderType === 2 && pay === true){
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console.log('200 元定金预购，得到50 优惠券');
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}else{
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return 'nextSuccessor';
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}
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};
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var OrderNormal = function(orderType,pay,stock){
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if(stock > 0){
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console.log('普通购买，无优惠券');
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}else{
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console.log('手机库存不足');
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}
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};
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// Chain.prototype.setNextSuccessor 指定在链中的下一个节点
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// Chain.prototype.passRequest 传递请求给某个节点
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var Chain = function(fn){
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this.fn = fn;
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this.successor = null;
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};
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Chain.prototype.setNextSuccessor = function(successor){
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return this.successor = successor;
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};
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Chain.prototype.passRequest = function(){
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var ret = this.fn.apply(this,arguments);
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if(ret === 'nextSuccessor'){
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return this.successor && this.successor.passRequest.apply(this.successor,arguments);
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}
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return ret;
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};
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var chainOrder500 = new Chain(Order500);
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var chainOrder200 = new Chain(Order200);
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var chainOrderNormal = new Chain(OrderNormal);
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chainOrder500.setNextSuccessor(chainOrder200);
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chainOrder200.setNextSuccessor(chainOrderNormal);
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chainOrder500.passRequest(1,true,500); // 输出：500 元定金预购，得到100 优惠券
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chainOrder500.passRequest(2,true,500); // 输出：200 元定金预购，得到50 优惠券
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chainOrder500.passRequest(3,true,500); // 输出：普通购买，无优惠券
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chainOrder500.passRequest(1,false,0); // 输出：手机库存不足
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Function.prototype.after = function(fn){
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var self = this;
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return function(){
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var ret = self.apply(this,arguments);
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if(ret === 'nextSuccessor'){
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return fn.apply(this,arguments);
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}
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return ret;
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}
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};
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var order = order500yuan.after(order200yuan).after(OrderNormal);
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order(1,true,500); // 输出：500 元定金预购，得到100 优惠券
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order(2,true,500); // 输出：200 元定金预购，得到50 优惠券
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order(1,false,500); // 输出：普通购买，无优惠券
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</script>

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