JavaScript 中的所有事物都是对象：字符串、数字、数组、日期，等等。
创建对象的四种方式：
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="utf-8" /> 5 <title></title> 6 </head> 7 <body> 8 <script type="text/javascript"> 9 //通过字面量 10 var obj={}; 11 //alert(typeof obj); 12 //通过字面量 13 var plane={ 14 username:"长江一号", 15 jihao:210, 16 color:'pink', 17 '100px', 18 height:'200px' 19 } 20 document.write(plane.username+plane.jihao+plane.color+plane.width+plane.height+"<hr />"); 21 //通过new object()创建 22 var plane1=new Object(); 23 plane1.username="长江一号"; 24 plane1.jihao=210; 25 plane1.color='pink'; 26 plane1.width='100px'; 27 plane1.height='200px'; 28 document.write(plane1.username+plane1.jihao+plane.color+plane.width+plane.height+"<hr />"); 29 //通过构造函数创建 30 function plane2(){ 31 this.username="长江一号"; 32 this.jihao=210; 33 this.color='pink'; 34 this.width='100px'; 35 this.height='200px'; 36 //return username; 37 } 38 //alert(plane2()); 39 var obj2=new plane2(); 40 document.write(obj2.username+obj2.jihao+obj2.color+obj2.width+obj2.height+"<hr />") 41 //通过Object.create() 42 var plane3=Object.create({ 43 username:"长江一号", 44 jihao:210, 45 color:'pink', 46 '100px', 47 height:'200px' 48 }) 49 document.write(plane3.username+plane3.jihao+plane3.color+plane3.width+plane3.height) 50 </script> 51 </body> 52 </html>