Function.prototype.method什么是原型[name](Function.prototype.method what is prototype[name])

Function.prototype.method什么是原型[name](Function.prototype.method what is prototype[name])

我试图不重复问题，因为我已经看到一些关于道格拉斯克罗克福德的Javascript好的部分书的问题/答案

我理解这段代码的大部分内容

Function.prototype.method = function (name, func) { this.prototype[name] = func; return this; }; Function.method('inherits', function (Parent) { this.prototype = new Parent( ); return this; }); var Mammal = function (name) { this.name = name; }.method('get_name', function () { return this.name; }).method('says', function() { return this.saying || ''; }); var Cat = function (name) { this.name = name; this.saying = 'meow'; }.inherits(Mammal) var myCat = new Cat('bagsley'); myCat.get_name();

我遇到的问题是this.prototype [name]为什么不写成this.prototype.name; 我知道返回这允许链接，这里的语法看起来非常类似于jQuery但我仍然没有获得原型[name]部分

感谢任何帮助

I'm trying not to duplicate questions obviously as I have seen some questions/answers regarding Douglas Crockford's Javascript the Good parts book

I understand most of this code

Function.prototype.method = function (name, func) { this.prototype[name] = func; return this; }; Function.method('inherits', function (Parent) { this.prototype = new Parent( ); return this; }); var Mammal = function (name) { this.name = name; }.method('get_name', function () { return this.name; }).method('says', function() { return this.saying || ''; }); var Cat = function (name) { this.name = name; this.saying = 'meow'; }.inherits(Mammal) var myCat = new Cat('bagsley'); myCat.get_name();

what I'm having trouble getting is the this.prototype[name] why isn't it written as this.prototype.name; I know returning this allows chaining and the syntax here looks very similar to jQuery but I still don't get the prototype[name] part

Any help is apprecaited thanks

最满意答案

obj.name和obj[name]之间存在差异。

这个...

obj.name = 123;

...将值123分配给（ "name"属性（对象）。

另一方面，这......

obj[ name ] = 123;

...将值123赋给那些名称等于name变量/参数值的属性。

所以：

var name = 'foo'; obj.name = 123; obj[ name ] = 456; // And now: obj.name; // 123 obj.foo; // 456

There is a difference between obj.name and obj[name].

This...

obj.name = 123;

...will assign the value 123 to the "name" property (of the object).

On the other hand, this...

obj[ name ] = 123;

...will assign the value 123 to those property which name is equal to the value of the name variable/argument.

So:

var name = 'foo'; obj.name = 123; obj[ name ] = 456; // And now: obj.name; // 123 obj.foo; // 456