###### tags: `Javascript`

# 1. Javascript 邏輯判斷

## == v.s ===
- 兩個等於:協助轉型 三個等於:會比較型別

## if else_if else
- 最後的else可以填入輸入資料不正確
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# 2. Javascript 陣列

## 陣列基本操作
- 陣列宣告

let colors = ['red','green','blue']

- 陣列基本操作

| Method |purpose|instance | value |
| -------- | -------- | -------- |-------|
| length |檢查長度|colors.length | 3 |
|push|塞東西到陣列尾|colors.push("X")|['red','green','blue','X']|
|unshift|塞東西到陣列首|colors.unshift('X')|['X','red','green','blue']|
|pop|刪掉陣列尾|colors.pop()|['red','green']|
|shift|刪掉陣列首|colors.shift()|['green','blue']|
|splice|第一個數字:起始位置,第二個數字:刪除幾筆|colors.shift(0,2)|['blue']|

# 3. Javascript 物件

## 物件新增

    home.name ="小明"
    home.num = 3

## delete 物件刪除

let home= {
    mother:"Mary",
    dad:"Tom",
    sister:"Angle",
    dog:"mos",
    people:3
};
//刪除狗狗
delete home.dog;

## (A) home.dog (B) home['dog'] 兩種物件讀取的方式

let home= {
    mother:"Mary",
    dad:"Tom",
    sister:"Angle",
    dog:"mos",
    people:3
};
//以下為兩種讀取方式
console.log(home.dog,home['dog'])

# 4. Javascript 物件與陣列混用
## 陣列裡面有物件

let market = [
    {
        bossName ="tom",
        staffNum = 3
    },
    {
        bossName ="andy",
        staffNum = 4
    };
]
//尋找混合物件
console.log(market[0].bossName);

## 陣列裡面的物件包物件

let market = [
        {
             bossStatus:{
                bossName:'Amy',
                bossAge:19,
                bossSex:'Female'
            },
            staffNum:20
        },
        {
            bossStatus:{
                bossName:'Andy',
                bossAge:45,
                bossSex:'Male'
            },
            staffNum:6
        }
]

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