JS ****************

 

let [x, [y, z]] = ['hello', ['JavaScript', 'ES6']];
x; // 'hello'
y; // 'JavaScript'
z; // 'ES6'



let [, , z] = ['hello', 'JavaScript', 'ES6']; // 忽略前兩個元素，只對z賦值第三個元素
z; // 'ES6'


var person = {
    name: '小明',
    age: 20,
    gender: 'male',
    passport: 'G-12345678',
    school: 'No.4 middle school',
    address: {
        city: 'Beijing',
        street: 'No.1 Road',
        zipcode: '100001'
    }
};
var {name, address: {city, zip}} = person;
name; // '小明'
city; // 'Beijing'
zip; // undefined, 因爲屬性名是zipcode而不是zip
// 注意: address不是變量，而是爲了讓city和zip獲得嵌套的address對象的屬性:
address; // Uncaught ReferenceError: address is not defined


var person = {
    name: '小明',
    age: 20,
    gender: 'male',
    passport: 'G-12345678',
    school: 'No.4 middle school'
};


// 把passport屬性賦值給變量id:
let {name, passport:id} = person;
name; // '小明'
id; // 'G-12345678'
// 注意: passport不是變量，而是爲了讓變量id獲得passport屬性:
passport; // Uncaught ReferenceError: passport is not defined


var person = {
    name: '小明',
    age: 20,
    gender: 'male',
    passport: 'G-12345678'
};


// 如果person對象沒有single屬性，默認賦值爲true:
var {name, single=true} = person;
name; // '小明'
single; // true


var x=1, y=2;
[x, y] = [y, x]

 

 

 

 

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