5.1 Object Type

There are two ways to create an object instance

① using the new operator with the object constructor

var person = new Object ();p erson.name = "Tom";p eison.age = 25;

② literal: The feeling of being encapsulated

var person = {    name: ' Tom ',  //' name ' = ' Tom '    age:25       //' age ' = 25};

Property names can also use strings.

The literal passes a large number of optional parameters:

function DisplayInfo (args) {        var output = "";        if (typeof Args.name = = "string") {            output = "Name:" + args.name + "\ n";        }        if (typeof args.age = = "Number") {            output = "Age:" + args.age + "\ n";        }        alert (output);    }    DisplayInfo ({    //literal parameter        name: "Tom",        age:25    });

Access Object properties can be expressed in dot notation and square brackets  

Alert (person["name"]);  Square brackets alert (person.name);     Point//variable to access the property var propertyname = "Name"; alert (Person[propertyname]);

You can also use square brackets if the property name contains a character that causes a syntax error, or if the property name uses a keyword or reserved word.

5.1 Object Type