Explain the implementation of ES5 class and inheritance in detail
Class implementation and class inheritance in ES5 is a high point in JS that has to be crossed and conquered. Whether in the process of learning, in order to better understand the implementation method of ES 6 class and learn the knowledge of prototype chain and ...
Added by serg4444 on Mon, 07 Mar 2022 20:39:59 +0200
Lesson 4 Basic _ constraint
Rules that act on fields in a table to restrict data stored in the table.
Ensure that the data is correct, valid and complete.
constraintdescribeKeywordNon-empty constraintRestrict the field to data that cannot be nullNOT NULLUnique ConstraintEnsure that all ...
Added by Gen-ik on Mon, 07 Mar 2022 20:13:22 +0200
Deep and shallow copyShallow copy: only the reference (address) is copied. That is, after copying, the original variable and the new variable point to the same thing, and their operations will affect each other.Deep copy: reallocate memory in the heap and have different addresses, but the values are the same. The copied object is completely iso ...
Added by rahnel on Mon, 07 Mar 2022 11:20:32 +0200
Added by raymedia on Mon, 07 Mar 2022 09:17:55 +0200
List rendering v-for instruction: 1. Used to display list data 2. Syntax: V-for = "(item, index) in XXX": key = "yyy" 3. Traversable: array, object, string (rarely used), specified number of times (rarely used) [it can also be used for list filtering (fuzzy query) and list sorting sortType (ascending and descending)]
How V ...
In CSS specification Scroll-linked Animations In, an epoch-making CSS function is introduced. That is -- The @scroll-timeline At rule, literally translated as rolling timeline.This article will take you to find out, from getting started to learning to use CSS @ scroll timeline.What is @ scroll timeline?What is @ scroll timeline?@Scroll timeline ...
Added by konrad on Mon, 07 Mar 2022 04:52:19 +0200
+Use a variable to save one or some elements in the page
+There are two types of methods to get elements
1. Get unconventional elements
=> html: document.documentElement
=> head: document.head
=> body: document.body
2. Get general elements
2-1. Get element by id
=>Syntax: document Getelementbyid ('element id name ')
Added by moehome on Mon, 07 Mar 2022 03:20:04 +0200
Learning objectives of this article
Be able to understand the concept and function of vue componentsBe able to master the ability of packaging componentsAbility to use communication between componentsAble to complete todo case
1. vue components
1.0_ Why use components
I've made a folding panel before
Requirements: now you want multiple p ...
Added by smclay on Mon, 07 Mar 2022 03:13:15 +0200
1, What is Axios
Axios is a promise based HTTP Library (similar to jQuery's Ajax for HTTP requests)Can be used for browsers and node JS (it can be used for both the client and the server written by node.js)
2, What are the features of Axios
Support promise APIIntercept requests and responsesConvert request data and response dataCance ...
Added by marc2000 on Mon, 07 Mar 2022 02:43:07 +0200