Javascript高手精华

var x // x undefinedvar x = 6; // x var x = "Bill"; // x

var carname="Bill Gates";

var carname='Bill Gates';

var x1=34.00; //var x2=34; //

var y=123e5; // 12300000var z=123e-5; // 0.00123

var cars=new Array();

cars[0]="Audi";

cars[1]="BMW";

cars[2]="Volvo";

var cars=new Array("Audi","BMW","Volvo");

var cars=["Audi","BMW","Volvo"];

var person={

firstname : "Bill",

lastname : "Gates",

id : 5566

};

name=person.lastname;

name=person["lastname"];

person=null;

var carname=new String;

var x= new Number;

var y= new Boolean;

var cars= new Array;

var person= new Object;