es6實現的繼承**：
class parent
static sayhello
() sayname()}
class child extends parent
sayage()}
let parent = new parent('parent');
let child = new child('child', 18);
複製**
// 1、構造器原型鏈
child.__proto__ === parent; // true
parent.__proto__ === function.prototype; // true
function.prototype.__proto__ === object.prototype; // true
object.prototype.__proto__ === null; // true
// 2、例項原型鏈
child.__proto__ === child.prototype; // true
child.prototype.__proto__ === parent.prototype; // true
parent.prototype.__proto__ === object.prototype; // true
object.prototype.__proto__ === null; // true
複製**
// es5 實現es6 extends的例子
function parent(name)
parent.sayhello = function
()parent.prototype.sayname = function
()function child(name, age)
// new
function
object
() f.prototype = proto;
return new f();
}function _inherits(child, parent)
_inherits(child, parent);
child.prototype.sayage = function
()var parent = new parent('parent');
var child = new child('child', 18);
複製**
parent = ,
sayhello: function
(), sayname: function
() }
child = object.create( parent );
child.sayage = function
() var child1 = object.create( child );
child1.init( "tom" );
var child2 = object.create( child );
child2.init('lili');
child1.sayhello();
child2.sayname();
複製**
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