//掺杂类实现聚合(有的时候，我们需要某个或多个类里的一些方法函数)//将要被聚合的函数var JSON = { ???toJsonString: function () { ???????var output = []; ???????for (key in this) { ???????????//这里this指代调用者 ???????????output.push(key + ‘-->‘ + this[key]); ???????} ???????return output; ???}};function mixin(receivingClass, givingClass) { ???for (methodName in givingClass) { ???????if (!receivingClass.__proto__[methodName]) { ???????????receivingClass.__proto__[methodName] = givingClass[methodName]; ???????} ???}}var o = { ???name: ‘long‘, ???age: 22}mixin(o,JSON);document.write(o.toJsonString().join(‘,‘))js函数聚合
原文地址：http://www.cnblogs.com/pjl43/p/7679775.html