How do constructors work without new keyword?

Hi guys,
I'm developing UI5 applicaitons.
I use jsview to build the UI.
In one of the pages, I need a dialog to popup.
So define a dialog in createContent funciton of the view:
        var dialog = new sap.m.Dialog(this.createId('idDlg'), {
            content: [
                new sap.m.Input()
            beginButton: new sap.m.Button({
                text: 'OK',
                press: [oController.onOKPressed, oController]
            endButton: new sap.m.Button({
                text: 'Cancel',
                press: [oController.onCancelPressed, oController]
But afterwards, I find there's no need to declare a variable to store the dialog instance, so I remove it, it still works:
        new sap.m.Dialog(this.createId('idDlg'), {
            content: [
                new sap.m.Input()
            beginButton: new sap.m.Button({
                text: 'OK',
                press: [oController.onOKPressed, oController]
            endButton: new sap.m.Button({
                text: 'Cancel',
                press: [oController.onCancelPressed, oController]
And after that, I'm using jslint to check code statically, lint tells me do not use new for side effects, so I remove the new keyword, it still works:
        sap.m.Dialog(this.createId('idDlg'), {
            content: [
                new sap.m.Input()
            beginButton: new sap.m.Button({
                text: 'OK',
                press: [oController.onOKPressed, oController]
            endButton: new sap.m.Button({
                text: 'Cancel',
                press: [oController.onCancelPressed, oController]
So I'm wondering why the constructor still works even without new?
what will the above code do?
And what's the difference between with and without new?
Regards,
Aaron.

Let me give you a simle example. say you've a constructor
var Constructor = function(name){
this.name = name;
You create an instance of constructor as,
var oInstance = new Constructor("My Instance);
the Constructor will get executed with the context 'this' as 'oInstance'.
oInstance.name // My Instance
var oInstance = Constructor("My Instance);
the Constructor will get executed with the context 'this' as 'window'.
oInstance.name // Type Error
window.name // My Instance

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