JavaScript_ Notes 8 Object Object

Create Object instance

new operator + Object constructor

E.g:

var person = new Object();  // new 操作符，Object构造函数
person.name = 'Ahua';   // 添加name属性，并赋值
person.age = 21; 		// 添加age属性，并赋值

Object literal

Use object literals to create an object instance in the above example, such as:

var person = {
    
    
	name : "Ahua',
	age : 21
}

An object is created with two attributes, name and age, and corresponding values. This object is stored in the variable person.
The last attribute can not be added with a comma, it will be wrong in IE7 or earlier and Opera; the
object literal is more recommended because it has a small amount of code and can give people a feeling of encapsulating data.

Square bracket notation to access object properties

Put the accessed attributes in square brackets in the form of strings, such as:

alert(person["name"]);    //访问person的name属性

The main advantage of square bracket notation-access object properties through variables

The main advantage of square bracket notation-access to object properties through variables, such as:

var propertyName = "name";
alert(person[propertyName]);
alert(person["name"]);
//如果属性名包含导致语法错误的字符，或属性名使用的关键字或保留字
//也可以采用方括号表示法
alert(person["first name"]);

Unless you must use variables to access attributes, dot notation is recommended