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There are two types of data in js, basic data type and reference data type. Basic data types NumberStringBooleanUndefinedNullSymbol (new to ES6)Reference data type ObjectArrayFunctionRegexp How to determine the data type: 1. The typeof is fine with the basic data type judgment, but when it comes to referenced data types (e.g. Array), it ...

preface: After many days, we have finished learning the object-oriented phase of Java. After all, we need to put it into practice. This small project is our first java object-oriented solution project. Next, let's enter the project world together catalogue 1, Project requirements 2, Function realization   3, Implementation of speci ...

JavaScript 1. General Ant Design History of JavaScript JavaScript is the most popular scripting language The language styles of Java and JavaScript are very different, just to rub the heat A qualified back-end person must be proficient in JavaScript 2. Quick start 2.1 importing JavaScript Internal labelExternal introduction <! ...

CGB2105-Day06 Shining sun 2021-07-28 09:53:19 2865 Category column: 2105 Article label: vue 2105 The column con ...

Catalog copy constructor this pointer Because this pointer points to its own object, we return this pointer to return our own object Assignment Operator Overload (Assignment Constructor, have I forgotten this statement, I've always called it that way) Complete class (parameterized, parameterized, copy, assignment, destructive) copy con ...

css layer When rendering a page, the browser will divide the page into many layers, ranging from large to small, with one or more nodes on each layer. When rendering DOM, what the browser does is actually: 1. After obtaining DOM, it is divided into multiple layers 2. Calculate style results for nodes of each layer (calculate style – st ...

Tabs are often used in web pages, so how to implement tabs? In the current framework, dom operation is omitted, and developers only need to pay attention to data. Is it really unnecessary to operate dom? Yes, it is necessary, but the program has helped to do this, and pure data logic will make the front end more difficult. Overall structure ...

1. Declare variables It is a good practice to declare variable assignment at the beginning of a function. This shorthand method can save you a lot of time and space when declaring multiple variables at the same time. Common writing let x; let y; let z = 3; Simplified writing let x, y, z=3; 2. Use ternary operators Your life becomes eas ...

catalogue 1, session Technology definition: Species difference (connotation): Creation and acquisition of session Syntax analysis of access and deletion of session value Case: 2, EL Why use EL? definition: Species difference (connotation): EL syntax: EL syntax - value by variable name Case: Jump to a jsp through the servlet and ...

preface Last [Mid Autumn Festival] realize the revolution of sun, earth and moon in pure CSS I dug a pit to simulate the revolution of the planets in the solar system around the sun. Today I'll fill the pit. There are only eight planets in the solar system: Mercury, Venus, earth, Mars, Jupiter, Saturn, Uranus and Neptune. Originally there w ...