Object types 物件型別

array 用 [ ]
object 用 { }

array

寫法:

var a = [
    "1",
    "2",
    "3"
];
//換行不換行都可以

也可以這樣寫:
var a = new Array("1", "2", "3");

a[0] 取第一個陣列值
a[-1] 取最後一個陣列值

• shift() 移動
  刪除array的第一個元素

const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.shift();

• unshift() 添加新元素

const fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.unshift("Lemon","Pineapple");

• push() 後增

• pop() 後刪

• shift() 前刪

• unshift() 前增

更多函式使用可以來W3Schools查看:JavaScript Array

object

• 物件.屬性 = 值
• 物件.方法(參數)

相同物件都有相同的屬性，不同的值；也會有相同方法

• key & Value
  object={key1:value, key2:value, key3:value}

範例:

var name = {
    firstName: "Banana",
    lastName: "Liao",
    fullName: function(){
         return this.firstName + " " + this.lastName
    }
}
console.log(member.fullName())
//實作結果: "Banana Liao"

typeof 查詢型別

typeof "Banana"   //"string" 
typeof 15         //"number" 
typeof true       //"boolean" 
typeof x          //"undefined"
typeof {name:'Banana', age:22}  //"object" 
typeof [1,2,3]                  //"object" 
typeof null                     //"object" 
typeof function func(){}        //"function(不是object)"