JavaScript面向对象的继承的几种方式

看了一些资料和视频，有五种方式实现继承，代码如下：

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/** * 继承的五种方法 * @author wangds * * * 1.call方法 * call方法是Function对象中的方法，因此我们定义的每一个函数都拥有该方法。 * 可以通过函数名来调用call方法，call方法的第一个参数会被传递函数中的this * 从第二个参数开始，逐一赋值给函数中的参数 * @param {Object} username */function Parent(username){this.username = username;this.sayHello = function(){alert(this.username);}}function Child(username, password){Parent.call(this,username);this.password = password;this.sayWorld = function(){alert(this.password);}}var parent = new Parent("wds");var child = new Child("zzh","you amd me");parent.sayHello();child.sayWorld();child.sayHello();/** * 2.apply */function ParentApply(username){this.username = username;this.sayHello = function(){alert("ParentApply.sayHello:" + this.username);}}function ChildApply(username, password){ParentApply.apply(this, new Array(username));this.password = password;this.sayWorld = function(){alert("ChildApply.sayWorld:" + this.password);}}var p = new ParentApply("wds");var c = new ChildApply("zzh", "pass");p.sayHello();c.sayWorld();c.sayHello();/** * 3.原型链 */function ParentProto(){}ParentProto.prototype.hello = "Wds Hello";ParentProto.prototype.sayHello = function(){alert(this.hello);}function ChildProto(){}ChildProto.prototype = new ParentProto();ChildProto.prototype.world = "wrp World";ChildProto.prototype.sayWorld = function(){alert(this.world);}var child = new ChildProto();child.sayHello();child.sayWorld();/** * 4.混合式 */function ParentMix(hello){this.hello = hello;}ParentMix.prototype.sayHello = function(){alert(this.hello);}function ChildMix(hello, world){ParentMix.call(this, hello);this.world = world;}ChildMix.prototype.sayWorld = function(){alert(this.world);}var childMix = new Child("Hello Mix", "World Mix");childMix.sayHello();childMix.sayWorld();/** * 5.对象冒充 */function ParentFirst(username){this.username = username;this.sayHello = function(){alert(this.username);}}function ChildFirst(username, password){this.method = ParentFirst;this.method(username);delete this.method;this.password = password;this.sayWorld = function(){alert(this.password);}}var firstParent = new ParentFirst("first Parent");var firstChild = new ChildFirst("firstChild","firstPassword");firstParent.sayHello();firstChild.sayHello();firstChild.sayWorld();

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