JavaScript AOP编程实例

 /* // aop({options}); // By: adamchow2326@yahoo.com.au // Version: 1.0 // Simple aspect oriented programming module // support Aspect before, after and around // usage: aop({ context: myObject,   // scope context of the target function. target: "test",     // target function name before: function() {  // before function will be run before the target function console.log("aop before"); }, after: function() {   // after function will be run after the target function console.log("aop after"); }, around: function() {  // around function will be run before and after the target function console.log("aop around"); } }); */ var aop = (function() { var options = {}, context = window, oFn, oFnArg, targetFn, targetFnSelector, beforeFn, afterFn, aroundFn, cloneFn = function(Fn) { if (typeof Fn === "function") { return eval('[' +Fn.toString()+ ']')[0]; } return null; }, checkContext = function() { if (options.context) { context = options.context; } if (typeof context[(options.target).name] === "function") { targetFnSelector = (options.target).name; targetFn = context[targetFnSelector]; } else if (typeof context[options.target] === "function") { targetFnSelector = options.target; targetFn = context[targetFnSelector]; } if (targetFn) { oFn = cloneFn(targetFn); oFnArg = new Array(targetFn.length); return true; } else { return false; } }, run = function() { context[targetFnSelector] = function(oFnArg) { if (aroundFn){ aroundFn.apply(this, arguments); } if (beforeFn){ beforeFn.apply(this, arguments); // 'this' is context } oFn.apply(this, arguments); if (afterFn){ afterFn.apply(this, arguments); // 'this' is context } if (aroundFn){ aroundFn.apply(this, arguments); } }; }; return function(opt){ if (opt && typeof opt === "object" && !opt.length) { options = opt; if (options.target && checkContext()) { if (options.before && typeof options.before === "function") { beforeFn = options.before; } if (options.after && typeof options.after === "function") { afterFn = options.after; } if (options.around && typeof options.after === "function") { aroundFn = options.around; } run(); } } }; })(); // test examples // ----------------- aop modify global function ---------------// function test(name, age) { console.log("test fn. name = " + name + " age: " + age); } aop({ target: "test", before: function() { console.log("aop before"); }, after: function() { console.log("aop after"); }, around: function() { console.log("aop around"); } }); // run test("adam", 6); // ----------------- aop test modify method in an object ---------------// var myobj = { myName: "testName", sayName: function() { console.log(this.myName); }, childObj: { age: 6, say: function() { console.log(this.age); } } }; aop({ context: myobj, target: "sayName", before: function() { console.log("aop before say name = " + this.myName); }, after: function() { console.log("aop after say name = " + this.myName); }, around: function() { console.log("aop around say name = " + this.myName); } }); // run myobj.sayName(); aop({ context: myobj.childObj, target: "say", before: function() { console.log("aop before say name = " + this.age); }, after: function() { console.log("aop after say name = " + this.age); }, around: function() { console.log("aop around say name = " + this.age); } }); myobj.childObj.say();