筆記 六角學院-JavaScript 工程師養成直播班 Part 2 陣列及物件

1.陣列

//[]陣列
const colors = ["yellow", "red", "blue"];  
const any = [123, true, "Tom"];//可混合
console.log(`colors陣列共用${colors.length}筆`);
let myColor = colors[2]; //讀取陣列，陣列從從0開始算 
console.log(myColor); // "blue"
myColor = colors[3]; //陣列從0開始 
console.log(myColor); // undefined

let colors = [];  
//寫入
colors[0] = "blue";
colors[1] = "yellow";
colors[3] = "red";
console.log(colors);//["blue","yellow", null,"red"]
console.log(`colors陣列共用${colors.length}筆`); //還是會有四筆
//push加入最後一筆
colors.push("black");
console.log(colors);//["blue","yellow",null,"red","black"];

2.物件

//物件{}
const family = {
	myFather: "David",//屬性 : 值
	myMonther: "Mary",//屬性 : 值
	dogs: 3
}; 
console.log(family.myFather); //讀取物件中屬性

let home =  {};
home.myMonther="May";//寫入
home.myFahter ="Kevin";
home.cats = 4;
console.log(home);  //{"myMonther": "May","myFahter": "Kevin", "cats": 4}

參考資料
六角線上課