versions

学好，并熟练的运用这门编程语言真的很难吗？本篇文章为大家总结了一些前端开发中最常用的JS代码片段，希望能对大家的学习以及工作上都能有所帮助，有所收获。 HTML5 DOM 选择器 javascript 代码 // querySelector() 返回匹配到的第一个元素 var item = document.querySelector('.item'); console.log(item); // querySelectorAll() 返回匹配到的所有元素，是一个nodeList集合 var items = document.querySelectorAll('.item'); console.log(items[0]); 阻止默认行为 javascript 代码 // 原生js document.getElementById('btn').addEventListener('click', function (event) { event = event || window.event； if (event.preventDefault){ // w3c方法 阻止默认行为 event.preventDefault(); } else{ // ie 阻止默认行为 event.returnValue = false; } }, false); // jQuery $('#btn')

假设需要下载Laravel/homestead这个包。 首先定位到地址： https://app.vagrantup.com/laravel/boxes/homestead/versions/8.0.0 然后直接在后面加上 “providers/virtualbox.box”就可以下载了 (注意virtualbox.box是指供应商的名字，不同供应商提供不同名字即可) https://app.vagrantup.com/laravel/boxes/homestead/versions/8.0.0/providers/virtualbox.box 参考网址： https://blog.csdn.net/weixin_33814685/article/details/91938829 来源： https://www.cnblogs.com/qq917937712/p/11539978.html

function createXHR(){ if(typeof XMLHttpRequest !='undefined'){ return new XMLHttpRequest(); }else if(typeof ActiveXObject!='undefined'){ if(typeof arguments.callee.ActiveXString!='string'){ var versions =['MSXML2.XMLHttp.6.0','MSXML2.XMLHttp.3.0','MSXML2.XMLHttp'],i,len; for(i=0,len=versions.length;i<len;i++){ try { //判断是否能成功创建当前版本的ActiveObject new ActiveXObject(versions[i]); arguments.callee.ActiveXString =versions[i]; //如果能设置当前对象的参数 break; } catch (error) { //跳过 } } } return new ActiveXObject(arguments.callee.ActiveXString); //根据当前函数的参数创建ActiveXObject } else{ throw new Error('No XHR object

A project I'm working on requires serializing a data structure before shutting down and restores its state from this serialized data when it start up again. Last year, we were building for .NET 1.1, and ran into a tricky issue where our code ran on .NET 2.0 a customer upgraded with some software that somehow set 1.1 as default our code ran on .NET 1.1 and was unable to deserialize its stored state This particular issue was "resolved" by barring that particular software upgrade, and shouldn't be a problem now that we're targeting the .NET 2.0 framework (so we can't possibly run on 1.1). What is

$HADOOP_USER_NAME #创建命名空间 create_namespace 'bd1902' #展示所有命名空间 list_namespace #删除命名空间,The namespace must be empty. drop_namespace 'IMUT' create 't1', 'f1', 'f2', 'f3' create 't1', {NAME => 'f1'}, {NAME => 'f2'}, {NAME => 'f3'} #创建一张表，指定版本号为3 create 'bd1902:student', 'baseinfo', 'extrainfo' create 'bd1902:student1', {NAME => 'baseinfo', VERSIONS => 3},{NAME => 'extrainfo',VERSIONS => 5} create 'bd1803:employee', 'baseinfo', 'extrainfo' create 'bd1803:employee1', {NAME => 'baseinfo', VERSIONS => 3},{NAME => 'extrainfo',VERSIONS => 5} describe 'bd1902:student2' describe 'bigdata:test1' hbase 热点问题

I would like to include a different file depending on the version of GCC. More precisely I want to write: #if GCC_VERSION >= 4.2 # include <unordered_map> # define EXT std #elif GCC_VERSION >= 4 # include <tr1/unordered_map> # define EXT std #else # include <ext/hash_map> # define unordered_map __gnu_cxx::hash_map # define EXT __gnu_cxx #endif I don't care about gcc before 3.2. I am pretty sure there is a variable defined at preprocessing time for that, I just can't find it again. There are a number of macros that should be defined for your needs: __GNUC__ // major __GNUC_MINOR__ // minor _

第二十二章 高级技巧 一、高级函数 1、安全的类型检测 由于typeof会出现无法预知的行为，instanceof在多个全局作用域中并不能正确工作，所以调用Object原生的toString方法，会返回[Object NativeConstructorName]格式字符串。每个类内部都有一个[[Class]]属性，这个属性中就指定了上述字符串中的构造函数名。 原生数组的构造函数名与全局作用域无关，因此使用toString方法能保证返回一致的值，为此可以创建如下函数： 1 function isArray(value){ 2 return Object.prototype.toString.call(value) == "[object Array]"; 3 } 也可以基于这一思路测试某个值是不是原生函数或正则表达式：（这一技巧广泛用来检测原生JSON对象） 1 //判断是否原生函数 2 function isFunction(value){ 3 return Object.prototype.toString.call(value) == "[object Function]"; 4 } 5 //判断是否原生函数 6 function isFunction(value){ 7 return Object.prototype.toString.call(value) == "

<script src="js/jquery-2.2.3.min.js"></script> <script> var browser = { versions: function() { var u = navigator.userAgent, app = navigator.appVersion; return { //移动终端浏览器版本信息 trident: u.indexOf('Trident') > -1, //IE内核 presto: u.indexOf('Presto') > -1, //opera内核 webKit: u.indexOf('AppleWebKit') > -1, //苹果、谷歌内核 gecko: u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1, //火狐内核 mobile: !!u.match(/AppleWebKit.*Mobile.*/), //是否为移动终端 ios: !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), //ios终端 android: u.indexOf('Android') > -1 || u.indexOf('Linux') > -1, //android终端或uc浏览器 iPhone: u.indexOf('iPhone') >

I'm using Versions for SVN. I attempt to commit and get this message: Commit failed (details follow): '/Users/mike/Sites/mysite.com/astss-cvsdude/Trunk/cart/flashfile.swf' is scheduled for addition, but is missing I suppose this is because I had added files to the repo, and then deleted them via the filesystem. I'd like to have it simply make note of my change, and apply the change to the repo. How can I get around this? I'm not sure what you're trying to do: If you added the file via svn add myfile you only told svn to put this file into your repository when you do your next commit . There's