Dynamic Object Initialization In JavaScript (just like PHP Reflection allows)?

Using Reflection in PHP I can dynamically create a object like so

$target = 'core_domain_Person';
$reflect = new ReflectionClass($target);
$obj = $reflect->newInstance();

I would like to replicate thi开发者_如何转开发s same concept in JavaScript is there a way to do this out of the box? Or is there a way to replicate what Reflection is doing?

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Your comment states:

So I can create "view controller" objects based on the requested view. I don't know until runtime what the view is that is being requested.

I suggest keeping all views in a views object like so:

var views = {
    Foo: function() {},
    Bar: function() {},
    Dah: function() {}
};

Then, using bracket notation, you can access any view constructor:

var viewName = 'Foo';
var instanceOfView = new views[viewName];

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SomeClass = function(arg1, arg2) {
    // ...
}

ReflectUtil.newInstance('SomeClass', 5, 7);

and implementation:

/**
 * @param strClass:
 *          class name
 * @param optionals:
 *          constructor arguments
 */
ReflectUtil.newInstance = function(strClass) {
    var args = Array.prototype.slice.call(arguments, 1);
    var clsClass = eval(strClass);
    function F() {
        return clsClass.apply(this, args);
    }
    F.prototype = clsClass.prototype;
    return new F();
};

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I don't think that there is such a thing like a Reflection API in JavaScript. But in JavaScript there are no classes, anyway. Prototypes / functions are (first-class) objects like anything else. Might be annoying, but might also be very useful.

function create_instance(prototypeName) {
    eval('return new ' + prototypeName + '()');

Didn't test this, though.