参考资料：
1. http://www.w3school.com.cn/js/js_datatypes.asp
2. http://blog.sina.com.cn/s/blog_85c1dc1001013u7z.html
☂ 知识点：
☞ Javascript拥有动态类型。
☞ undefined表示变量不含值。
☞ null用于清空变量。
- 字符串
var answerOne="Nice to meet you!";
var answerTwo="He is called 'Bill'";
var answerThree='He is called "Bill"';
- 数字
var x1=34.00; //使用小数点来写
var x2=34; //不使用小数点来写
var y=123e5; //
var z=123e-5; // 0.00123
- 布尔
var x=true
var y=false
- 数组
var carsOne=new Array();
cars[0]="Audi";
cars[1]="BMW";
cars[2]="Volvo"; var carsTwo=new Array("Audi","BMW","Volvo"); var carsThree=["Audi","BMW","Volvo"];
- 对象
var person={firstname:"Bill", lastname:"Gates", id:5566};
var person={
firstname : "Bill",
lastname : "Gates",
id : 5566
};
person=new Object();
person.firstname="Bill";
person.lastname="Gates";
person.age=56;
person.eyecolor="blue";
person.autoplay=function(){
alert("play.......");
}
name=person.lastname;
name=person["lastname"];
- 声明变量类型
可以用关键字new来声明变量的类型。
var carname=new String;
var x= new Number;
var y= new Boolean;
var cars= new Array;
var person= new Object