10 2022 档案
摘要：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv
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摘要：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv
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摘要：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv
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摘要：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv
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摘要：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv
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摘要：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv
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摘要：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv
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摘要：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv
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摘要：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv
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摘要：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv
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摘要：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv
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摘要：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv
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摘要：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv
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摘要：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv
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摘要：//手机构造函数 function Phone(brand, price) { this.brand = brand; this.price = price; } //添加 方法 Phone.prototype.call = function() { console.log('我打电话') } //
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摘要：map为键值对集合 let m = new Map(); m.set('name', '小白'); m.set('chang', function() { console.log("改变自己"); }) let key = { school: 'NONGDA' }; m.set(key, ['bei
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摘要：let arr = [1, 2, 3, 4, 5, 4, 3, 2, 1]; //数组去重 let result = [...new Set(arr)]; console.log(result); //交集 let arr2 = [4, 5, 5, 6, 6]; let result = [...n
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摘要：//实例化Promise对象 const p = new Promise(function(resolve, reject) { setTimeout(() => { // let data="数据库中的数据"; // resolve(data); let err = "数据读取失败"; rejec
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摘要：//模拟获取用户数据 订单数据和商品数据 function getUsers() { setTimeout(() => { let data = "用户数据"; //调用nexxt方法，并且将数据传入 iterator.next(data); }, 1000); } function getOrde
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摘要：//生成器就是一个特殊的函数 function* gen(params) { console.log("111"); yield '两只老虎'; console.log("222"); yield '跑得快'; console.log("333"); yield '真奇怪'; console.log
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摘要：//声明一个对象 const banji = { name: "一班", stus: [ "xiaobai", "xiaohei", "xiaohua", "king" ], [Symbol.iterator]() { //声明索引变量 let index = 0; let _this = this
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摘要：箭头为=何>的结合体 声明和调用 // let fn=function(){ // } let fn = (a, b) => { return a + b; } //调用函数 let rest = fn(1, 2); console.log(rest); 特性 1this是静态的，始终指向函数声明的
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摘要：name = "xiaobai"; chage = function() { console.log("我想改变")； } const Xiaobai = { name, chage, fly() { console.log("我想飞"); } } 变量和函数都可以省略冒号后面的属性 里面声明的函数
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摘要：//数组解构 const f4 = [小白, 小黄, 小黑, 小花]; let [bai, huang, hei, hua] = f4; console.log(bai); console.log(huang); console.log(hei); console.log(hua); //对象解构
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摘要：1为常量声明。一定要赋初始值 2一般常量使用大写 3一般常量值不能修改 4为块级作用域
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摘要：特性 1变量不能重复声明 2块级作用域内声明只在内部生效 3不存在变量提升 let a = "a"; console.log(a); { let f = "aaa"; } //console.log(f); 4不影响作用域链
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