<script type="text/javascript">

/* 增加函数 */

function augment(receivingClass, givingClass) {

  for(methodName in givingClass.prototype) {

    if(!receivingClass.prototype[methodName]) {

      receivingClass.prototype[methodName] = givingClass.prototype[methodName];

    }

  }

}

/* 改进的增加函数 */

function augment(receivingClass, givingClass) {

  if(arguments[2]) { // Only give certain methods.

    for(var i = 2, len = arguments.length; i < len; i++) {

      receivingClass.prototype[arguments[i]] = givingClass.prototype[arguments[i]];

    }

  }

  else { // Give all methods.

    for(methodName in givingClass.prototype) {

      if(!receivingClass.prototype[methodName]) {

        receivingClass.prototype[methodName] = givingClass.prototype[methodName];

      }

    }

  }

}

var Author = function Author(name, books) { // 构造函数

  this.name = name;

  this.books = books || 'default value';

};

Author.prototype = {

  getName: function() {

    return this.name;

  },

  getBooks: function() {

    return this.books;

  }

};

var Editor = function Editor() {

};

Editor.prototype = {

  hello: function() {

    return 'Hello,'+this.name;

  }

};

augment(Author, Editor);

var author = new Author('Ross Harmes', ['JavaScript Design Patterns']);

console.log(author.getName());

console.log(author.getBooks());

console.log(author.hello());

</script>