Programmer Think

Node. News crawler and network search (JS) Project requirements 1, Reptile part 1. Complete the web page analysis and crawler design of the target website. 2. Crawl no less than 100 pieces of data (each data includes 7 fields, news keywords, news titles, news dates, news authors, news sources, news abstracts and news contents), and store ...

JS prototype prototype chain value and reference type 1 Review 1.1 Object type 1. establish Object Object of type ① Direct quantity {} ② Object Constructor ③ Object function 2. Read / write object properties . [] Must use[]There are two cases of syntax:① The attribute name does not conform to the identity name specifica ...

3.sildUp() and sildDown() methods Description: slideUp() indicates that jq objects are slid up and hidden, and slideDown() indicates that jq objects are pulled down. be careful: Even if these two methods do not write parameters, they have a certain animation time by default, but the time is shortSimilarly, numbers can be written in these t ...

In lesson3, we reviewed the content related to the JS scope, understood the JS scope, and looked at the closure again, which was very easy. 1. Concept of closure Let's add a knowledge point first (PS: if you don't think it's easy to understand, just look at the code ~), Lexical scope: "The execution of a function depends on the variable ...

35. Search insertion position (simple) Given a sort array and a target value, find the target value in the array and return its index. If the target value does not exist in the array, return the position where it will be inserted in order. You must use an algorithm with a time complexity of O(log n). This is an ordinary binary search. When ...

Hello everyone, let's revisit JavaScript. Last time, we reviewed the relevant contents of the prototype together. Let's take a map and review the contents last time:   Do you remember the last time? Click this link to view the last review: Revisit JavaScript(lesson11): object orientation (4) This time, we will learn more about JS object-or ...

Preface Native drag events have many criticisms. For example, the element that follows the mouse pointer when dragging is too simple. For example, dataTransfer is inaccessible except for start and drop, which makes drop elements less likely to accept drop. For example, there is no elegant way to set the mouse pointer during dragging. For examp ...

1, Project introduction The main function of this project is to support dragging the text editing area or commodity picture to the canvas for editing and adjustment according to the uploaded background picture as the canvas, and finally generate the picture and css style for use by other terminals. This project is based on html/vue/css / n ...

      1, Vue first experience 1.1 Vue installation     . The introduction of Internet links can be obtained from BootCDN <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.14/vue.js">     . npm installed locally stay Visual Studio Code Terminal input: npm install vue@2.6.14 <script src="../node_mod ...

What is promise, use and implementation of promise What is promise It is a new constructor in es6, which contains an asynchronous operation promise is a solution of asynchronous programming, which solves the problem of hell callback. It is a way of chain transfer Promise is simply a container that holds the results of an event (usually an asy ...