创建一个 HTMLCollection [英] create a HTMLCollection

问题描述

我正在尝试填充 Element.prototype.children 应该返回一个 HTMLCollection

有一个 window.HTMLCollection

不过

var h = new HTMLCollection();
//TypeErrror: HTMLCollection is not a constructor

和

var h = Object.create(HTMLCollection.prototype);
h[0] = div;
h.item(0); 
// Could not convert JavaScript argument

测试 Firefox 7 和 Chrome

Test Firefox 7 and Chrome

除了填充 HTMLCollection 之外，还有什么方法可以与之交互吗?

Apart from shimming HTMLCollection is there any way to interact with it?

如果您能提出解决方案，还请提供有关此 github 问题的反馈

Also provide feedback on this github issue if you can suggest a solution

推荐答案

我会这样做:

function MyHTMLCollection( arr ) {
    for ( var i = 0; i < arr.length; i += 1 ) {
        this[i] = arr[i];
    }

    // length is readonly
    Object.defineProperty( this, 'length', {
        get: function () {
            return arr.length;
        }
    });

    // a HTMLCollection is immutable
    Object.freeze( this );
}

MyHTMLCollection.prototype = {
    item: function ( i ) {
        return this[i] != null ? this[i] : null;
    },
    namedItem: function ( name ) {
        for ( var i = 0; i < this.length; i += 1 ) {
            if ( this[i].id === name || this[i].name === name ) {
                return this[i];
            }
        }
        return null;
    }
};

其中 arr 是一个常规数组，包含所有应该在 HTMLCollection 中的 DOM 元素.

where arr is a regular array that contains all the DOM elements which should be inside the HTMLCollection.

待办事项:

• 参数 arr 应该事先检查:它是一个数组吗?该数组的所有元素都是 DOM 元素吗?

• the argument arr should be checked beforehand: Is it an array? Are all elements of that array DOM elements?

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