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Unconsciously, I have been developing nodejs for more than a year. I learned a lot in the process and forgot a lot, so I still insist on leaving some content in the blog for later reference. This article mainly realizes a simple website crawler function, grabs the website inside picture as well as the content. Before grabbing, the modules of SU ...

1, introduction Asynchronous programming is too important for the Javascript language. The execution environment of Javascript language is "single thread". If there is no asynchronous programming, it cannot be used at all. It must be stuck. Now I'll focus on how the Generator function performs asynchronous op ...

Problem Description: use js to implement a clone() cloning function, which will clone one of the different types of input values Number, String, Undefined, Boolean, Function,Null,Object,Array,RegExp 1, Solution code Post code directly, function clone(obj){ var copy; switch(typeof obj){ case 'undefined':b ...

This paper mainly introduces the method of realizing Boolean operation with polylines //Get all the curves after Boolean operation function getOperatedCurves(sourceCurs: Curve[], targetCus: Curve[]) { let source: Polyline | Circle = (sourceCurs[0] instanceof Circle) ? sourceCurs[0] as Circle : new Polyline().Co ...

Preface It's a bit awkward to see some background management systems can't be implemented by themselves. So I have made up for the front-end knowledge. Choose a vue framework for learning. Here are some learning ideas thinking 1. Learn the properties and methods of Vue objects 2. Learning two-way binding 3. Use of lea ...

Infinite Ajax Scroll, or ias for short, is a jQuery scrolling ajax paging plug-in. When the page scrolls to the visible part of the container, the data will be loaded asynchronously and automatically. The integration of plug-ins is very simple, including the following steps: 1. jquery.js and jquery-ias.min.js are re ...

nginx.conf user www www; # Nginx's worker processes run users and user groups worker_processes 4; # Number of startup processes, usually set equal to the number of CPUs #worker_processes auto; #The following parameters specify which cpu is assigned to which process, generally speaking, there is no special specific ...

1. JSX syntax In react, the syntax of jsx is used to display DOM elements. The react template of a basic jsx syntax is as follows: <div>{this.props.title}</div> The essence of this approach is: embed js expressions in html!! How does the compiler compile jsx syntax? The rule is as follows: when it comes to parsi ...

FileReader gets base64 code of picture and previews it FileReader, to be honest, I'm not familiar with it. It's just a record of usage here. Method name parameter describe abort none Interrupt read readAsBinaryString file(blob) Read file as binary readAsDataURL file(blob) Read file as DataURL readAsText fil ...

Uncaught TypeError: Cannot set property 'onclick' of null; One sentence: "make sure that dom node rendering of click events is performed before JS!" Solve. A native JS click event written by myself. JS code is written on the home page <script type="text/javascript"> var all_features = document ...