var A = Class('A', Object)
  .method('constructor', function(){
    this.name = 'a';
  });

var B = Class('B', A);
B.method('run', function(){
  console.log('run');
});

var C = B.extend('C')
  .method('run', function(a){
    console.log('run a: ', a);
  })
  .method('run', function(a,b){
    console.log('run a, b: ', a, b);
  });

var c = C();
c.run();
c.run(1);
c.run(1,2);

var Class = require('path/to/Class.js');
var ClassA = Class('ClassA', Object);

<script src="path/to/Class.js"></script>
<script>
    var ClassA = Class('ClassA', Object);
</script>

var ClassA = Class('ClassA', Object);
var ClassB = Class('ClassB', ClassA);

var ClassA = Class('ClassA', Object);
console.log(ClassA.name) // => ClassA
var ClassB = Class('some name', ClassA);
console.log(ClassB.name) // => some name

var ClassA = Class('ClassA', Object);
ClassA.parent === Object; // => true
var ClassB = Class('ClassB', ClassA);
ClassB.parent === ClassA; // => true

var ClassA = Class('ClassA', Object)
    .method('constructor', function(){
        // 构造函数
        this.name = 'no name';
    })
    .method('constructor', function(name){
        // 重载构造函数
        this.name = name;
    })
    .method('run', function(){
        // 普通方法
        console.log('run');
    })
    .method('run', function(a,b){
        // 重载上面定义的 run 方法
        console.log('run a, b: ', a, b);
    })
    .method('run', '*', function(){
        // 其他任意参数的情况
        console.log(arguments);
    });

var a = ClassA();
var b = ClassA('Li Lei');
console.log(a.name); // => no name
console.log(b.name); // => Li Lei
a.run(); // => run
a.run(1,2); // => run a, b: 1 2
a.run(4,5,6); // => [4,5,6]
a.run(7,8,9,0,1,2,3); // => [7,8,9,0,1,2,3]

var ClassA = Class('ClassA', Object)
    .classmethod('run', function(){
        // 类方法
        console.log('class method run');
    });

ClassA.run(); // => class method run

var ClassA = Class('ClassA', Object);

// 下面两种写法是等价的
var ClassB = Class('ClassB', ClassB);
var ClassB = ClassA.extend('ClassB');

var ClassA = Class('ClassA', Object)
    .method('run', function(){
        // 普通方法
        console.log('run');
    });

ClassA.alias('aliasRun', 'run');

var a = ClassA();
a.run(); // => run
a.aliasRun(); // => run
a.run === a.aliasRun; // => true

var ClassA = Class('ClassA', Object)
    .method('run', function(){
        // 普通方法
        console.log('ClassA run');
    });

var ClassB = ClassA.extend('ClassB')
    .method('run', function(){
        ClassB.uper('run').apply(this, arguments);
        console.log('ClassB run');
    });

var ClassC = ClassB.extend('ClassC')
    .method('run', function(){
        ClassC.uper('run').apply(this, arguments);
        console.log('ClassC run');
    });

var c = ClassC();
a.run();
// => ClassA run
// => ClassB run
// => ClassC run