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The current mainstream HTTP protocol versions are HTTP/1.1, HTTP/2, HTTP/3 (experimental). The specific version used when the request occurs is determined by the client, and the client and the server negotiate together. For example, a client that supports HTTP/2 will indicate that it supports h2 and http/1.1 in the ALPN (Application-Layer Protocol Negotiation) extension when […]

This article introduces the installation, configuration and operation of django in ubuntu. The main content includes its use cases, application skills, summary of basic knowledge points and matters needing attention. It has certain reference value, and friends who need it can refer to it. 1 Install django, make sure python is installed before installation, it

Q: How does the toggle method know whether it is show or hide now, and there is no return value true or false. How to get it, because I just want to judge whether the current is show or hide and need to execute some code, experts answer! Answer: If there is such an element:

Just use localStorage directly, and the value obtained is an object. The result printed in the browser console is as follows: … The post How to get all values ​​stored in localStorage first appeared on Lenix Blog . This article is reprinted from https://blog.p2hp.com/archives/9665 This site is for inclusion only, and the copyright belongs to

1.for in The for in loop is the most basic way to traverse an object, and it also gets the properties on the object’s prototype chain // Create an object and specify its prototype, bar is a property on the prototype const obj = Object . create ( { bar : ‘bar’ } ) //

Method 1: indexOf() (recommended) var str = “123”; console.log(str.indexOf(“3”) != -1 ); // true The indexOf() method returns the first occurrence of a specified string value in a string. If the string value to be retrieved does not appear, the method returns -1. Method 2: search() var str = “123”; console.log(str.search(“3”) != -1 ); //

select last_name , job_id from employees where manager_id is null ; select last_name , job_id from employees where manager_id <=> Null ; select last_name , job_id from employees where manager_id = Null ; last = null is wrong If one of the values, strings, or expressions on either side of the equal sign is NULL,

The first <script type=”text/html” id=”see-bar”> <a class=”layui-btn layui-btn-primary layui-btn-xs ” data-id=”” onclick=”see(this)” lay-event=”See” style=”color:#2880cb”>< /a> </script> table.render({ . . . , cols: [[ , { ‘13%’, title: ‘card number’, align: ‘center’, rowspan: ‘1’, toolbar: ‘#see-bar’ } ]] . . . }); the second , cols: [[ { type: … The post rendering html objects in

js method to split string Applicable to each scene is different const arr = [ ‘1-2’ , ‘1-3’ , ‘2-3’ , ‘3-4’ ] ; 1. string.split() Separated by special characters ‘1-2’ . split ( ‘-‘ ) // [‘1’, ‘2’] 2. String.substring(start,stop) start is required. A non-negative integer specifying the position in string of the first

The layui table tree supports asynchronous requests, supports reload and reloading, supports sort sorting and sorting, can asynchronously request background data to generate new cotyledon nodes, and can edit cells and other functions. https://gitee.com/yangqianlong98/tableTree … The post layui table tree, supports asynchronous requests – jquery,js treetable first appeared on Lenix Blog . This article is

Take the click event as an example: Normal binding event: $(‘.btn1’).click(function(){} binding on binding event: $(document).on(‘click’,’.btn2′,function(){} binding So what’s the difference between these two ways? First let’s look at the difference in practice: ①The click event is after the page is loaded, all the elements with the class name btn1 are obtained, and then the

With the development of live video streaming, many live streaming teams may encounter live video freezes, frequent buffering flags, or live video clips. What are the reasons for the lag in live video viewing? In combination with practical experience, I also made an anatomical analysis of the problem and solution of the stuck live broadcast

Excellent performance, giving users a smooth experience and reducing the loss of users. This article introduces the ideas and methods to improve front-end performance. Included Performance can be divided into load-time performance and runtime performance . Load-time performance refers to the performance of the page loading process. Runtime performance refers to the performance of the