从DOM来构造原型

Question

我想分配到与功能也对原型创建我的原型的DOM元素分配元素。

我在下面的评论中描述的所有。

摘要：我的原型功能应该产生的DOM元素，把它们放进体内，并立即指派参考他们的原型的财产如。 Game.prototype.boxes = //新创建的DOM元素。

function Game() { 

    this.class = 'box'; 
    // this.boxes = this.createBoxes(); // It almost works, but isn't on prototype and is duplicated, when I create instance of Monstar class. 

} 

// Game.prototype.boxes = this.createBoxes(); // I know, in this context 'this' isn't my constructor, but this is method I want to achieve 
// Game.prototype.boxes = $('.' + this.class); // As above - 'this' isn't my constructor 
Game.prototype.boxes = Game.prototype.createBoxes(); // Alternative test from the lines above. It have to be on my prototype. 

Game.prototype.createBoxes = function() { 

    var docFragment = document.createDocumentFragment(); 

    for(var i = 0; i < 20; i++) { 

     var elem = $('<div>', { 
      class: this.class 
     }); 

     elem.appendTo(docFragment); 

    } 

    $(docFragment).appendTo($('body')); 

    return $('.' + this.class); 

}; 

function Monster() { 

    Game.call(this); 

    console.log(this.boxes); // Finally this should returns array with my DOM elements created using prototype createBoxes function. 

} 

Monster.prototype = Object.create(Game.prototype); 
Monster.prototype.constructor = Monster; 

var game = new Game(), 
    monster = new Monster(); 

console.log(game.boxes); // Finally this should returns array with my DOM elements created using prototype createBoxes function. 

感谢所有帮助:)

Answer 1

没有必要为createBoxes是在原型。事实上，它并不需要坚持围绕在所有一旦它完成了它的工作，所以我只希望它内联（从实例class财产转移到功能以及）：

Game.class = "box"; 
Game.prototype.boxes = (function() { 
    var docFragment = document.createDocumentFragment(); 
    for(var i = 0; i < 20; i++) { 
     var elem = $('<div>', { 
      class: this.class 
     }); 
     elem.appendTo(docFragment); 
    } 
    $(docFragment).appendTo($('body')); 
    return $('.' + Game.class); 
})(); 

我中号相当肯定你意识到这一点，只是强调的是：你必须一个阵列盒，这是由Game所有实例（和Monster所有实例等）共享。

如果class会每Game不同，那么在原型上有boxes根本没有任何意义。

---

下面是完整的代码与变革：

function Game() { 
} 
Game.class = "box"; 
Game.prototype.boxes = (function() { 
    var docFragment = document.createDocumentFragment(); 
    for(var i = 0; i < 20; i++) { 
     var elem = $('<div>', { 
      class: this.class 
     }); 
     elem.appendTo(docFragment); 
    } 
    $(docFragment).appendTo($('body')); 
    return $('.' + Game.class); 
})(); 

function Monster() { 
    Game.call(this); 
    console.log(this.boxes); 
} 
Monster.prototype = Object.create(Game.prototype); 
Monster.prototype.constructor = Monster; 

var game = new Game(), 
    monster = new Monster(); 

console.log(game.boxes);