var arr = []; //創(chuàng)建一個(gè)棧
arr.push("apple");//壓入元素"apple" ["apple"]
arr.push("orange");//壓入元素"orange" ["apple","orange"]
arr.pop();//彈出"orange" ["apple"]
arr.push("banana");//壓入元素"banana" ["apple","banana"]

function Person(id,name,age){
this.id = id;
this.name = name;
this.age = age;
}
var num = 10;
var bol = true;
var str = "abc";
var obj = new Object();
var arr = ['a','b','c'];
var person = new Person(100,"jxl",22);