//*
setTimeout(() => {
console.log('>>>>>>>>>>>>> Reflect.construct');
console.log(new String(123));
console.log(Reflect.construct(String, [123]));
}, 0);
//*/
//*
setTimeout(() => {
console.log('>>>>>>>>>>>>> Reflect.apply');
function Person() {
this.name = 'foo'
this.getName = function (num) {
return this.name + num
}
}
this.name = 'bar'
const person = new Person()
console.log(person.getName(1));
console.log(person.getName.apply(this, [2]));
console.log(Reflect.apply(person.getName, this, [2]));
}, 0);
//*/
//*
setTimeout(() => {
console.log('>>>>>>>>>>>>> Reflect.ownKeys');
let myObject = Object.create(null) // 此时myObject并没有继承Object这个原型的任何方法,因此有：
console.log('myObject.hasOwnProperty === undefined: ', myObject.hasOwnProperty === undefined); // 此时myObject是没有hasOwnProperty这个方法，那么我们要如何使用呢？如下：
console.log('Object.prototype.hasOwnProperty.call(myObject, "foo"): ', Object.prototype.hasOwnProperty.call(myObject, 'foo')); // 是不是很恐怖，写这么一大串的代码！！！！
console.log('Reflect.ownKeys(myObject): ', Reflect.ownKeys(myObject));
}, 0);
//*/
//*
setTimeout(() => {
console.log('>>>>>>>>>>>>> Reflect.ownKeys -> Symbol');
var s = Symbol('foo');
var k = 'bar';
var o = { [s]: 1, [k]: 1 };
console.log('Object.getOwnPropertyNames(o): ', Object.getOwnPropertyNames(o));
console.log('Object.getOwnPropertySymbols(o): ', Object.getOwnPropertySymbols(o));
console.log('Reflect.ownKeys(o): ', Reflect.ownKeys(o));
}, 0);
//*/
//*
setTimeout(() => {
console.log('>>>>>>>>>>>>> Reflect. get/set/has');
const testObject = {
a: 'you',
b: 'like'
}
console.log('Reflect.get(testObject, "a"): ', Reflect.get(testObject, 'a'));
Reflect.set(testObject, 'a', 'me')
console.log('Reflect.get(testObject, "a"): ', Reflect.get(testObject, 'a'));
console.log('Reflect.has(testObject, "a"): ', Reflect.has(testObject, 'a'));
console.log('Reflect.has(testObject, "d"): ', Reflect.has(testObject, 'd'));
}, 0);
//*/
//*
setTimeout(() => {
console.log('>>>>>>>>>>>>> Reflect.getPrototypeOf');
let object = { name: 'rrr', age: 18 }
console.log('Object.getPrototypeOf(object): ', Object.getPrototypeOf(object));
console.log('Reflect.getPrototypeOf(object): ', Reflect.getPrototypeOf(object));
console.log('Object.getPrototypeOf(1): ', Object.getPrototypeOf(1));
// 等同于Object.getPrototypeOf(),唯一不同的是当传参target不是一个对象的时候：前者会强制将target转为一个对象。
// console.log('Reflect.getPrototypeOf(1): ', Reflect.getPrototypeOf(1));
}, 0);
//*/
//*
setTimeout(() => {
console.log('>>>>>>>>>>>>> for of/in Array');
let array = [1, 2, 3]
for (const iterator of array) {
console.log(iterator);
}
for (const key in array) {
console.log('1>>>> ', key);
if (Object.hasOwnProperty.call(array, key)) {
const element = array[key];
console.log('2>>>> ', element);
}
}
console.log('>>>>>>>>>>>>> for in Object');
let object = { name: 'rrr', age: 18 }
for (const key in object) {
console.log('1>>>> ', key);
if (Object.hasOwnProperty.call(object, key)) {
const element = object[key];
console.log('2>>>> ', element);
}
}
}, 0);
//*/
const target = {
notProxied: "original value",
proxied: "original value"
};
const handler = {
get: function (target, prop, receiver) {
if (prop === "proxied") {
return "replaced value";
}
// return Reflect.get(...arguments);
return target[prop];
}
};
const proxy = new Proxy(target, handler);
console.log(proxy.notProxied); // "original value"
console.log(proxy.proxied); // "replaced value"
const a = [
{
path: '4.mp3',
isPlaying: true,
lastBeginTime: 104,
player: 'payer-1'
},
{
path: '6.mp3',
isPlaying: true,
lastBeginTime: 106,
player: 'payer-2'
},
{
path: '5.mp3',
isPlaying: false,
lastBeginTime: 102,
player: 'payer-3'
},
]
isPlaying, lastBeginTime
6
