var me = this的价值是多少？ [英] What is the value of var me = this;

问题描述

我在ExtJS源代码中找到这种模式。

I find this pattern all over the ExtJS source code.

method: function() {
  var me = this;
  ...
  me.someOtherMethod();
}

为什么他们不使用 code>？经常定义我（不需要输入2个字符），有始终有什么优势吗？我可以理解，如果他们试图通过关闭来维护上下文，但是在没有关闭的地方完成。

Why don't they just use this? Is there some advantage to always often defining me (outside of not having to type 2 characters)? I can understand if they are trying to maintain the context via closure, but it's done in places where there is no closure at all.

Ext.panel.Panel的一个例子：

An example from Ext.panel.Panel:

disable: function(silent) {
    var me = this;

    if (me.rendered) {
        me.el.addCls(me.disabledCls);
        me.el.dom.disabled = true;
        me.onDisable();
    }

    me.disabled = true;

    if (silent !== true) {
        me.fireEvent('disable', me);
    }

    return me;
},

推荐答案

我可以比这个短得多。

这篇关于var me = this的价值是多少？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！