javascript - 模块化模式中的私有(private)实例变量

Question

var foo = (function(){

    var _blah;

    function doStuff(){
        //how to make _blah instance specific
        //and access it here?
    }

    function bar(blah){
        _blah = blah;
        doStuff();
        //this.blah = blah?
    }

    bar.prototype.getBlah = function(){ return _blah; };

    return bar;

})();

var foos = [];

$.each([1,2,3], function(i, v){
    var f = new foo(v);
    foos.push(f);
});

//all instances of foo
//gets _blah set to 3
console.log(foos[1].getBlah()); 

我对上述模块有两个问题:

• 如何设置每个实例特定的属性？现在您可以看到 _blah 被覆盖，这是非常明显的。但我需要一些语法方面的帮助。我的猜测是我需要像注释一样在构造函数中设置它。这是正确的做法吗？
• 如何通过其他方法访问该属性？据我所知，this指的是doStuff()中的window。

http://jsfiddle.net/ncg2M/1/

Answer 1

How do I set a property that is specific for each instance? Right now you can see that _blah gets overwritten, which is pretty obvious. But I need some help with the syntax. My guess is that I need to set it in the constructor like the comment. Is that the right way to do it?

是的。这是正确的方法，使用 this.blah =//value，当然，这使得变量 blah 可以不受任何限制地公开访问。

How do I access the property in another method? As far as I know, this refers to window in doStuff().

doStuff() 方法没有多大意义，因为当您在模块内定义类似的函数时，它通常是由其他实例方法使用的实用函数。