为什么将自定义传单控件添加为大写和小写?

问题描述

我正在查看扩展传单文档，以添加自定义控件.

I am looking at the Extending Leaflet documentation for adding custom controls.

其中包含以下代码段，作为添加简单水印控件的示例:

It contains this code snippet as an example of adding a simple watermark control:

L.Control.Watermark = L.Control.extend({
    onAdd: function(map) {
        var img = L.DomUtil.create('img');

        img.src = '../../docs/images/logo.png';
        img.style.width = '200px';

        return img;
    },

    onRemove: function(map) {
        // Nothing to do here
    }
});

L.control.watermark = function(opts) {
    return new L.Control.Watermark(opts);
}

L.control.watermark({ position: 'bottomleft' }).addTo(map);

为什么将控件同时分配给大写(L.Control.Watermark)和小写L.control.watermark变量?扩展JavaScript库时，这是常见的约定吗?

Why is the control assigned to both uppercase (L.Control.Watermark) and lowercase L.control.watermark variables? Is this a common convention when extending JavaScript libraries?

推荐答案

如果您查看名为扩展传单:类理论，您会看到名为工厂:

If you look at the tutorial named Extending Leaflet: Class Theory, you'll see a section named Factories:

基本上， lowerCamelCase 函数是实例化相应类的一种便捷方法.您会发现很多文章，为什么要在构造函数上使用工厂函数，这个似乎很全面

Basically, the lowerCamelCase function is a convenience method to instantiate the corresponding class. You'll find plenty of articles on why use factory functions over constructors, this one seems quite comprehensive

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