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我需要使用参数数组创建一个新的 View 实例。因为我不想打电话

 new View(array)

我试过这个解决方案。但不幸的是,这不起作用,这意味着没有 arg 被传递到初始化函数中。那么是否可以创建一个传入数组的新视图,但在初始化函数中只有一次参数?

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1 回答 1

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您可以通过一些原型技巧来实现这一点:

function createView() {
    var args = arguments;

    //create a factory function, so we can get the "this" context
    function Factory() { return YourViewClass.apply(this, args);}

    //assign factory prototype (essentially makes factory a YourViewClass)
    Factory.prototype = YourViewClass.prototype;

    //invoke factory function
    return new Factory();
};

var view1 = createView({model:model}, 1, 2, 3);
var view2 = createView.apply(null, argumentArray);

使用可变参数实例化任何“类”(构造函数)的通用解决方案:

function instantiate(ctor) {
    //strip first arg, pass rest as arguments to constructor
    var args = Array.prototype.slice.call(arguments, 1);
    function Factory() { return ctor.apply(this, args);}
    Factory.prototype = ctor.prototype;
    return new Factory();
};

//call directly
var view1 = instantiate(YourViewClass, {model:model}, 1, 2, 3);

//partially apply to create a factory for a specific view class
var viewFactory = _.partial(instantiate, YourViewClass);
var view2 = viewFactory({model:model}, 1, 2, 3);
于 2013-02-19T11:44:07.427 回答