仅从对象名称中获取对Javascript对象的引用？

Question

In javascript, Suppose I have a string called, str = "document" . How do I get the Object, Document which references it from the string name?

So what I would like to have is, take the string and get the reference to the Object, with the string name in the current closure.

str = "window"; I would need the reference to the Window Object here.

Is there a dynamic way to get these references?

function getObject(str){
/* logic */

} 

getObject('window'); // returns [object Window]
getObject('document'); // returns [object HTMLDocument]

Use Case: I'm trying to fuzz a few stuff which comes from an array of strings. Here is what am trying to do. Would be great if you guys could tell me the best way to do this.

function hook(Obj, prop, newValue) {
    console.log(Obj, typeof Obj, prop);
        Object.defineProperty(Obj, prop, {
            'get': function () {
                return newValue;
            }
        });     
}

function test(Obj, prop) {
    var before = Obj[prop];
    hook(Obj, prop, 'xyz);
    var after = Obj[prop];

    if( before == after){
        alert(Obj + '.
        '+ prop +'
        Not Changed ');
    } else {
        alert(Obj + '.
        '+ prop +'
        Changed ');
    }
}

var data = [['document', 'domain'], ['window.document', 'location'], ['location', 'href']];
var i=0;
for(i=0; i<data.length; i++){
    test(data[i][0], data[i][1]);
}

Answer 1

If your object is a global one, then you can do it like this -

window['your-window-object'];

If it a property of another object, then you can do it like this -

obj['property-name'];

In every cases, you need to know the scope of the variable.

Example -

var doc = window['document'];  // gives you the document object
var obj = {
    prop1: 1;
    prop2: 2
}

var propValue = obj['prop1']; // gives you 1

For local variables, you might be tempted to use eval , but you should almost always it. For more information, just google it.

Answer 2

You can obtain the reference by using

function getObject(str)
{
    console.log(this[str]);
}