RE主题的文章列表，还有RE的技术要点_第1094页

react生命周期

组件载入阶段：componentWillMount:组件即将被装载、渲染到页面上，只调用1次componentDidMount:组件真正在被装载之后，这里可以拿到真实DOM执行操作，只调用1次运行中状态：componentWillReceiveProps(nextProps):组件将要接收到新属性的时候调用，在这时se...

IT猿 ·2020-03-27

React的类型检测PropTypes

React.propTypes：React.PropTypes 提供很多验证器来验证传入数据的有效性，当向props传入无效数据时，JavaScript控制台会抛出警告。vardata=123;classMyTitleextendsReact.Component{staticpropTypes={title:...

IT猿 ·2020-03-27

javaScript---RegExp

字符串是编程时涉及到的最多的一种数据结构，对字符串进行操作的需求几乎无处不在。比如判断一个字符串是否是合法的Email地址，虽然可以编程提取@前后的子串，再分别判断是否是单词和域名，但这样做不但麻烦，而且代码难以复用。正则表达式是一种用来匹配字符串的强有力的武器。它的设计思想是用一种描述性的语言来给字符串定义一个规则，...

IT猿 ·2020-03-27

require和import区别

遵循的模块化规范不一样模块化规范：即为JavaScript提供一种模块编写、模块依赖和模块运行的方案。谁让最初的JavaScript是那么的裸奔呢——全局变量就是它的模块化规范。require/exports出生在野生规范当中，什么叫做野生规范？即这些规范是JavaScript社区中的开发者自己...

IT猿 ·2020-03-27

js扩展运算符（spread）三个点（...）

常见用法：1、该运算符主要用于函数调用。functionpush(array,...items){array.push(...items);}functionadd(x,y){returnx+y;}varnumbers=[4,38];add(...numbers)//42 2、扩展运算符取代apply方法的一...

IT猿 ·2020-03-27

reduce方法简单实现数组中对象去重

js数组的reduce方法，接收一个函数（必须）和指定的初始值（非必须）作为参数，函数有三个参数，分别为初始值，当前项，当前数组，进行累加或者累积操作，初始值为每次累加或者累计后的结果注意：在ie9一下的浏览器中，并不支持该方法！语法：arr.reduce(fn(pre,cur,arr){},[initialValue...

IT猿 ·2020-03-27

How to get the parents of a merge commit in git?

gitrev-list--parents-n1uk-645ec1aaab4714f7b47136e1e43744a70fc11a9f0 【theidofcurrentcommit】f49cddd09d099ed3a04fe608c2b4fc3e159fbb47025a7525fabb4...

IT猿 ·2020-03-27

What is the difference between Clustered and Non-Clustered Indexes in SQL Server?

Fromthediscussionwefindfollowingdifferencesbetweenclusteredandnon-clusteredindexes.Therecanbeonlyoneclusteredindexpertable.However,youcancreatemultiplenon-clust...

IT猿 ·2020-03-27

This request has been blocked because sensitive information could be disclosed to third party web sites when this is used in a GET request.

2020-03-1611:04:35,168ERROR[13]:System.InvalidOperationException:Thisrequesthasbeenblockedbecausesensitiveinformationcouldbedisclosedtothirdpartywebsiteswhenthi...

IT猿 ·2020-03-27

What is the difference between Shrink Database and File?

Simply...DBCCShrinkDatabase():shrinkallfilesDBCCShrinkFile():justonefileForexample,youmayhavealogbackupissueandit'sgrownoutofcontrolsoyourunDBCCShrinkFile().You...

IT猿 ·2020-03-27

RedGate support tickets

https://forum.red-gate.com/discussion/84930/use-drop-and-create-did-not-work-with-index-on-both-normal-column-and-computed-columnhttps://forum.red-gate.com/disc...

IT猿 ·2020-03-27

Git rename from index.lock to index failed

Inmycase,thiswascausedbyusingthesameGitrepofrombothadminandnon-admincommandprompts.Whenlastgitpullwasfromadmincmd,theindexwascreatedbyit,andthennon-admincmdhadi...

IT猿 ·2020-03-27

HOW TO: Configure Internet Information Services Web Authentication in Windows Server 2003

HowtoConfigureIISWebSiteAuthenticationUseanadministrativeaccounttologontotheWebserver.StartIISManageroropentheIISsnap-in.ExpandServer_name,whereServer_nameisthe...

IT猿 ·2020-03-27

Enabling IIS and required IIS components on Windows Server

TolearnhowtoenableIISandtherequiredIIScomponentsonWindowsServer2012/2012R2,seetheinstructionsbelow.OpenServerManagerandclickManage>AddRolesandFeatures.ClickN...

IT猿 ·2020-03-27

How can I manually create a authentication cookie instead of the default method?

Hereyougo.ASP.NETtakescareofthisforyouwhenyouusethehigherlevelmethodsbuiltintoFormsAuthentication,butatthelowlevelthisisrequiredtocreateanauthenticationcookie.&...

IT猿 ·2020-03-27