追求JS小姊姊系列 Day5 – 工具人登場

x = ["JS的水","JS不要的垃圾","JS的指甲"]; 

//對應的索引值
[0] = "JS的水"
[1] = "JS不要的垃圾"
[2] = "JS的指甲"

let x = ["JS的水",9487,function(){return "cool"},{name:"Js",age:56,}]
console.log(x[0])
console.log(x[1])
console.log(x[2])
console.log(x[3])

x = ["JS的水","JS不要的垃圾","JS的指甲"]; 


//1.新增內容
//把新的內容加在頭，並回傳新的陣列長度
x.unshift("JS要放在頭的東西")
console.log(x,"unshift");

//把新的內容加在尾，並回傳新的陣列長度
x.push("JS要放在尾的東西")
console.log(x,"push");

//2.減去內容
//頭
x.shift()
console.log(x,"shift");

//尾
x.pop();
console.log(x,"pop");

let  x = {
name:"JS",
age:888,
interested:function(){console.log("cool")},
toolMenList: ["array","function","object"],
}
//簡單建立一個方法＆屬性
x.friend = String;
console.log(x.friend)

let x = {
name:"JS",
age:888,
interested:function(){console.log("cool")},
toolMenList =["array","function","object"],
}

let  x = {
name:"JS",
age:888,
interested:function(){console.log("cool")},
toolMenList: ["array","function","object"],
}
//簡單建立一個方法＆屬性:
//1.點運算子
x.friend = String;
console.log(x.friend)

//2.[]運算子
x["cool"] = "cool!";
console.log(x.cool);


//delet
delet x.cool
//接下來就不會看到cool這個特性了