Javascript has three different kinds of properties: named data property, named accessor property and internal property. There are two kinds of access for named properties: get and put, corresponding to retrieval and assignment, respectively. Please r…

The Object.entries() function is an addition to the ECMAscript scpec in Es2017. This allows us to iterate through the properties of an object and read the entries as keys and objects. const obj = { foo: 'bar', baz: 42 }; console.log(Object.entries(ob…

How do I add new attribute (element) to JSON object using JavaScript? JSON stands for JavaScript Object Notation. A JSON object is really a string that has yet to be turned into the object it represents. To add a property to an existing object in JS…

在IOS开发中有时会用到Object和javaScript相互调用,详细过程例如以下: 1. Object中运行javascript代码,这个比較简单,苹果提供了非常好的方法 - (NSString *)stringByEvaluatingJavaScriptFromString:(NSString *)script 2. javascript运行过程中返回给Object的数据或者调用Object方法.这个时候就须要用到 UIWebView的地址重定向功能.主要代码例如以下: (1)创建UIWe…

What is the most efficient way to deep clone an object in JavaScript? Reliable cloning using a library Since cloning objects is not trivial (complex types, circular references, function etc.), most major libraries provide function to clone objects. D…

http://www.codeproject.com/Articles/581060/HowplustoplusGetplusSharePointplusClientplusContex Download source code Introduction The first step of app development is to correctly get access to SharePoint client context. I have struggled to develop a s…

********************* from Professional JavaScript for Web Development Execution Context And Scope The execution context of a variable or function defines what other data it has access to, as well as how it should behave. Each execution context has a…

枚举对象属性 for....in 列举obj的可枚举属性,包括自身和原型链上的 object.keys() 只列举对象本身的可枚举属性 创建对象的几种方式 对象字面量 const pre='test' const obj= { "name":"luyun", [pre+'prop']:"wu shuang lian quan" } 通过构造函数 const obj= new Object() const d = new Date() Object…

数组是可迭代的,所以数组可以用于for of,字符串也是可迭代的,所以字符串也可以用作for of,那么,对象呢? 试一试: var somebody = { start:0, end:100 } for (const iterator of somebody) { console.log(iterator); } //somebody is not iterable 如你所见,not iterable!,但是我们可以把一个对象定制成可迭代的,接下来:  Symbol.iterator 是一个对…

js小技巧 每一项都是js中的小技巧,但十分的有用! 1.document.write(""); 输出语句  2.JS中的凝视为//  3.传统的HTML文档顺序是:document->html->(head,body)  4.一个浏览器窗体中的DOM顺序是:window->(navigator,screen,history,location,document)  5.得到表单中元素的名称和值:document.getElementById("表单中元素的I…