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Senior Care News & Communities

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日期格式转换 yyyy-MM-ddNews
Senior Care News

日期格式转换 yyyy-MM-dd

let d1 = new Date(this.lists.joindate); this.lists.joindate = d1.getFullYear() + "-" + (d1.getMonth() + 1) + "-" + d1.ge...

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对$nexttick的理解News
Senior Care News

对$nexttick的理解

$nexttick 的详细说明: $nexttick 是一个异步编程的概念,常见于一些 JavaScript 框架和库中,比如 Vue.js 和 React.js。它允许你推迟一个函数的执行,以便在当前的 JavaScript 代码块执行完成之后再执行该函数。这对于处理一些需要在...

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本地存储和会话存储的用法和区别News
Senior Care News

本地存储和会话存储的用法和区别

一.localStorage:本地存储 提供的是一种永久性的存储方法,在关闭掉网页重新打开时,存储的内容依然保留 将data保存到localStorage(本地存储) 方法一: localStorage.setItem("data", data) 方法二: localStorag...

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SE5寄生组合式继承News
Senior Care News

SE5寄生组合式继承

// ES5继承三步骤: // 1).在子类构造函数中调用父类构造函数,让子类实例化出来的对象拥有父类的属性 // 2).让子类的原型成为父类的实例,让子类实例化出来的对象拥有父类的方法 // 3).找回丢失的构造函数 // 定义父类 function User(usernam...

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ES6继承News
Senior Care News

ES6继承

// SE6的继承 class User { constructor(username, password) { this.username = username; this.password = password; } login() { console.log(this.u...

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类型检测-toStringNews
Senior Care News

类型检测-toString

// toString可以检测所有类型 // 前言:由于大部分的类型都有 toString()方法,无法通过原型链找到Object的toString() 方法,所以需要强制使用Object.prototype.toString.call(对象) //基本类型检测 console...

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检测类型-isArrayNews
Senior Care News

检测类型-isArray

// isArray判断是否为数组 let arr = let arr1 = { name: "张三" } console.log(Array.isArray(arr)); //判断arr是否为数组,返回值:true console.log(Array.isArray(arr1...

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类型检测-instanceofNews
Senior Care News

类型检测-instanceof

let arr = // 判断arr是否属于某个类 console.log(arr instanceof Array);//判断是否属于数组类 返回值:true console.log(arr instanceof Object);//判断是否属于引用类 返回值: true l...

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