在Javascript中，这是什么意思底线？ [英] In Javascript, what does this underscore mean?

问题描述

var Gallery = Backbone.Controller.extend({
    _index: null,
    _photos: null,
    _album :null,
    _subalbums:null,
    _subphotos:null,
    _data:null,
    _photosview:null,
    _currentsub:null,
    routes: {
        "": "index",
        "subalbum/:id": "subindex",
        "subalbum/:id/" : "directphoto",
        "subalbum/:id/:num" : "hashphoto"
    },
    initialize: function(options) {
        var ws = this;
        if (this._index === null){
            $.ajax({
                url: 'data/album1.json',
                dataType: 'json',
                data: {},
                success: function(data) {
                    ws._data = data;
                    ws._photos =
                    new PhotoCollection(data);
                    ws._index =
                    new IndexView({model: ws._photos});
                    Backbone.history.loadUrl();
                }
            });
            return this;
        }
        return this;
    },
    //Handle rendering the initial view for the
    //application
    index: function() {
        this._index.render();
    },

我读放在这里Backbone.js的教程：<一href=\"http://addyosmani.com/blog/building-spas-jquerys-best-friends/\">http://addyosmani.com/blog/building-spas-jquerys-best-friends/

什么是底线？ （_index，_photos，_album）为什么使用它们？

What are the underscores? (_index, _photos, _album) Why use them?

推荐答案

这意味着私人领域或私有方法。方法，这些方法仅用于内部使用。

It means private fields or private methods. Methods that are only for internal use.

他们不应该之类的外部调用。

They should not be invoked outside of the class.

私有字段包含供内部使用的数据。

Private fields contain data for internal use.

它们不应该被读出或从类以外写入（直接地）。

They should not be read or written into (directly) from outside of the class.

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