JavaScript object literal

In JavaScript, objects can be created through class instantiation, or objects can be created directly using object literals.

In programming languages, literals are a notation for representing values. For example, "Hello, World!" represents a string literal in many languages. JavaScript is no exception, such as 5, true, false and null, which respectively represent an integer, two Boolean values and an empty object.

JavaScript supports object literals, allowing objects to be created using a concise and readable notation.

An object literal is a list of name/value pairs, each name/value pair is separated by commas and finally enclosed in curly brackets. A name/value pair represents a property or method of an object, with the name and value separated by a colon.

For example:

var myCar={ "price" : ",000" , // 属性 "color" : "red" , // 属性 "run" : function(){ return " 120 km/h "; } // 方法 } var myHome={ population : "10,000" , area : "10,000" , adress : { // 属性 country : "China" , province : "shanxi" , city : "xian" }, say : function(){ // 方法 return "My hometown is very beautiful ! "; } }

Create a zhangsan object:

var zhangsan={ name : "张三", sex : "男", say:function(){ return "嗨！大家好，我来了。"; }, contact : { tel : "029-81895644", qq : "1370753465", email : "it@gmail.com" } } alert("姓名："+zhangsan.name); alert("性别："+zhangsan.sex); alert(zhangsan.say()); alert("电话："+zhangsan.contact.tel); alert("QQ："+zhangsan.contact.qq); alert("邮箱："+zhangsan.contact.email);

You can see:

• Use object literals to create a single Object,semantics are intuitive.

• Object literals can be nested.

#Object literals can also be created first and then add properties and methods.

The zhangsan object above can also be created like this:

var zhangsan={} zhangsan.name = "张三"; zhangsan.sex = "男"; zhangsan.say = function(){ return "嗨！大家好，我来了。"; } zhangsan.contact = { tel : "029-81895644", qq : "1370753465", email : "it@gmail.com" }