在 JavaScript 中公开方法。为什么是这个语法？
我正在研究 TinyMCE 代码，并偶然发现了这种公开公共方法的方式：
tinymce.extend(this, {
execCommand : execCommand,
queryCommandState : queryCommandState,
queryCommandValue : queryCommandValue,
addCommands : addCommands
});
如果编写上述内容有什么好处可以使用下面的代码来代替（同一任务所需的代码行数更少，执行时间也更少！）
this.execCommand = execCommand;
this.queryCommandState = queryCommandState;
this.queryCommandValue = queryCommandValue;
this.addCommands = addCommands;
或者甚至更短，在对象声明中的某处：
execCommand: execCommand,
queryCommandState: queryCommandState,
queryCommandValue: queryCommandValue,
addCommands: addCommands
问题在哪里？
I was studying TinyMCE code and stumbled upon this way of exposing public methods:
tinymce.extend(this, {
execCommand : execCommand,
queryCommandState : queryCommandState,
queryCommandValue : queryCommandValue,
addCommands : addCommands
});
What is the benefit of writing the above if the below code can be used instead (with fewer lines of code and less execution time required for the same task!)
this.execCommand = execCommand;
this.queryCommandState = queryCommandState;
this.queryCommandValue = queryCommandValue;
this.addCommands = addCommands;
Or even shorter, somewhere in the declaration of an object:
execCommand: execCommand,
queryCommandState: queryCommandState,
queryCommandValue: queryCommandValue,
addCommands: addCommands
Where's the catch?
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好吧，让我惊讶的一件事是您拥有的第一个示例是 TinyMCE 需要其
extend函数的参数。查看
extend的源代码，它会检查每个键值对是否未定义，只有在已定义的情况下才将它们添加到对象中。因此，在扩展类时有一些有用的附加功能。Well, one thing that jumps out at me is the first sample that you have there is the method in which the TinyMCE expects its arguments for its
extendfunction.Glancing at the source of
extend, it checks each key value pair forundefined, only adding them to the object if they're defined. So, there's a little bit of added functionality that can be useful when extending a class.