[Javascript] 物件的存取

結構：
stockTagList: { [key]: { name: "Default" } }

其中 [key]代表是變數，若沒有[]，則key就是字串key

內容：

stockTagList: {

        abc: { name: "Default" },

        xyz: { name: "Tech" },

        test: { name: "Finance" }

    }

讀取所有key和value：

for (const [key, value] of Object.entries(gAppSetting.stockTagList)) {

    console.log(key);         // abc

    console.log(value.name);  // Default

}

結果：

key=abc, name=Default

key=xyz, name=Tech

key=test, name=Finance

只取 key：

const keys = Object.keys(stockTagList) 回傳的是陣列

方法1：for...of

for (const key of Object.keys(gAppSetting.stockTagList)) {

    console.log(key);

    const item = gAppSetting.stockTagList[key];

    console.log(item.name);

}

方法2：forEach

Object.keys(gAppSetting.stockTagList).forEach(key => {

    console.log(key);

    console.log(gAppSetting.stockTagList[key].name);

});

方法3：用 index

const keys = Object.keys(gAppSetting.stockTagList);

for (let i = 0; i < keys.length; i++) {

    const key = keys[i];

    console.log(key);

    console.log(gAppSetting.stockTagList[key].name);

}

只取 value：

Object.values(gAppSetting.stockTagList)

方法同上