Question

我需要使用arguments数组创建一个新的View实例。因为我不想打电话

 new View(array)

我试过了this solution。但不幸的是，这不起作用，这意味着没有arg传递给initialize函数。那么创建一个新的View传递给一个数组但是在initialize函数中只有一次参数吗？

Answer 1

您可以通过一些原型技巧来实现这一目标：

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）的一般解决方案：

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);

如何使用apply创建新的Backbone View

1 个答案: