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Author: Hu ChengqingMember of aikesheng DBA team, good at fault analysis and performance optimization, personal blog: https://www.jianshu.com/u/a95... , welcome to the discussion.Source: original contribution*It is produced by aikesheng open source community. The original content cannot be used without authorization. For reprint, please contact ...

& & other algorithms 1, Algorithm Given an array of prices, its ith element price [i] represents the price of a given stock on day I. You can only choose to buy this stock one day and sell it on a different day in the future. Design an algorithm to calculate the maximum profit you can make. Return the maximum profit you can make ...

Master Ajax in an hour Click jump for one hour to master Ajax video Life, one stop has one stop of scenery, one year has one year of taste, your age should be the medal of your life, not the reason for your sadness. What is AJAX? AJAX = Asynchronous JavaScript and XML. AJAX is a technology that can update some web pages without ...

The front end uses the El upload component of element UI to upload pictures El upload uploads pictures. When the picture upload is completed and the picture address (server address) transmitted from the back end is obtained, the upload component is hidden and the picture is displayed: <el-upload v-if="!imgUrl" class="upload-demo" drag ...

1. Turn off the firewall systemctl stop firewalld && systemctl disable firewalld 2. Switch to Alibaba source wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo yum clean all && yum makecache 3. Install gcc yum install gcc gcc-c++ Confirm whether the installation is successful Co ...

introduce Minimal config spring boot starter is an expanded lightweight configuration center based on the implementation principle of spring boot native configuration injection. The project volume is only 24KB. The design concept is to serve small and medium-sized projects, quickly build a remote configuration center and refresh the configurat ...

Vue summary (VI) -- Vuex advanced preface This blog is a further summary based on the previous blog. So I suggest you take a look at the last blog first. Previous: Vue summary (V) -- Introduction to Vuex The main contents of this blog include: gettersmapState and mapGettersmapMutations and mapActionsCase: multi component data sha ...

It's said that there are still many small partners who don't know the method of network data collection. Let me see who they are. I'll call the roll without talking. I've shared the tutorial below. If you need it, you can get it yourself. ( https://jq.qq.com/?_wv=1027&k=kYtMeTfp ) Generally, the following four methods can match the resul ...

1, Pain points of uploading large files at the front end 1. Too many files lead to tight bandwidth resources and reduced request speed; 2. If the service is interrupted, the network is interrupted and the page crashes during the upload process, the file may be uploaded again. 2, Analysis of pain points The front end selects the file and uplo ...

Basic concepts Process is the program that the computer has run. Thread is the smallest unit that the operating system can schedule operations. It is included in the process Every Tab page in the browser opens a process, which contains many threads As we all know, JS is a single threaded language. If we encounter very time-consuming operations ...