//1, 推薦使用var newObject = {};//2,var newObject = Object.create( null );//3, 不推薦var newObject = new Object();

// ECMAScript 3 兼容的方式// 1. 常規(guī)對(duì)象定義方式//設(shè)置屬性newObject.someKey = "Hello World";//獲取屬性var key = newObject.someKey;// 2. 方括號(hào)方式// 設(shè)置屬性newObject["someKey"] = "Hello World";//獲取屬性var key = newObject["someKey"];// 僅僅用于ECMAScript 5// 3. Object.defineProperty// 設(shè)置屬性O(shè)bject.defineProperty( newObject, "someKey", { value: "for more control of the property's behavior",  writable: true,  enumerable: true,  configurable: true});//可以通過(guò)下面的函數(shù)簡(jiǎn)化屬性設(shè)置var defineProp = function ( obj, key, value ){  config.value = value;  Object.defineProperty( obj, key, config );};// 使用方法var person = Object.create( null );defineProp( person, "car", "Delorean" );defineProp( person, "dateOfBirth", "1981" );defineProp( person, "hasBeard", false );// 4. Object.defineProperties//設(shè)置屬性O(shè)bject.defineProperties(newObject,{ "someKey": { value: "Hello World", writable: true }, "anotherKey": { value: "Foo bar", writable: false }});// 3和4的獲取屬性方法同1,2.

function Car( model, year, miles ) {  //這里，this指向新建立的對(duì)象自己  this.model = model;  this.year = year;  this.miles = miles;  this.toString = function () {    return this.model + " has done " + this.miles + " miles";  };}//用法// 建立兩個(gè)car實(shí)例var civic = new Car( "Honda Civic", 2009, 20000 );var mondeo = new Car( "Ford Mondeo", 2010, 5000 );// 輸出結(jié)果console.log( civic.toString() );console.log( mondeo.toString() );

function Car( model, year, miles ) {  this.model = model;  this.year = year;  this.miles = miles;}Car.prototype.toString = function () {  return this.model + " has done " + this.miles + " miles";};// 用法var civic = new Car( "Honda Civic", 2009, 20000 );var mondeo = new Car( "Ford Mondeo", 2010, 5000 );//輸出console.log( civic.toString() );console.log( mondeo.toString() );