Summary of usage of adding and removing instances in javascript

This article will share with you how to add and remove class names using JavaScript. Friends who need it can refer to it. Method 1: Use the className attribute; Method 2: Use the classList API; // Used to match whether the class name exists or not. function reg(name){ return new RegExp('(^|\\s)'+name+'(\\s+|$)'); } //hasClass addClass removeClass toogleClass var hasClass,addClass,removeClass; if('classList' in document.documentElement){ hasClass=function(obj,cname){

1. JavaScript class name addition and removal implementation code sharing

Introduction: This article will share with you how to add and remove class names in JavaScript. Friends who need it can refer to it

2. Mongodb sharding principle learning and trial (5) Adding and removing shard

Introduction: 1. This morning I encountered a question about the host settings. Part of it is localhost. The other part is hostname, which causes failure when adding shards to sharding. Special record. Problem: Each shard of an existing sharding is another mongod process of the local machine. When adding the shard, db.runCommand({addshard:"localhost:po

##3 . 1. Mongodb sharding simulates adding and removing shards from multiple nodes in the win7 environment

Introduction: This article mainly introduces simulating mongo sharding on a win7 computer. If there are multiple servers, each mongo can be deployed on a single computer. We will configure 3 mongo shards and 3 configuration servers. 1 routing server. Configure as shown in the figure below to introduce how to add shards and remove shards vcD4KPHA+PHN0cm9uZz7Su6Ouz8LU2G1vbmdvZGI8L

4. JavaScript implements the drag-and-drop function of web page objects. Method_javascript skills

Introduction: This article mainly introduces the method of JavaScript to realize the drag and drop function of web page objects, involving JavaScript's judgment of the browser and the event love you Related operation skills such as adding and removing are of great practical value. Friends in need can refer to the following

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