Tag：scope
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Time：2021-6-22
1. Declaration assignment of let, VaR, const var b = 1; let a = 2; const c = 3; console.log(“a”, a); // 1 console.log(“b”, b); // 2 console.log(“c”, c); // 3 2. The scope of let, VaR, const Under the overall situation var a = 1; let b = 2; const c = 3; console.log(“a”, […]
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Time：2021-6-21
Video address Headline address:https://www.ixigua.com/i676544267458235648…Station B address:https://www.bilibili.com/video/av78062009?…Netease cloud classroom address:https://study.163.com/course/introduction…. Explanation content 1. New vector(1) New empty vector let v: Vec<i32> = vec::new(); (2) New vector with initial value let v = vec![1, 2, 3]; 2. Update vector let mut v = Vec::new(); v.push(5); v.push(6); 3. When you discard a vector, you also discard all its […]
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Time：2021-6-16
What is V8? V8 is an open source JavaScript engine developed by Google, which is currently used in Chrome browser and node.js. Its core function is to execute JavaScript code that is easy for human to understand. V8 adopts the technology of mixed use of compiler and interpreter, which is called JIT (just in time) […]
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Time：2021-6-12
preface Since the birth of JavaScript language, the road of module standardization has been tortuous. Various solutions have emerged in the community, including AMD, CMD, commonjs, and so on. Then ECMA added module function in JavaScript language standard level (because this function was introduced in es2015 version, it will be called ES6 module in the […]
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Time：2021-6-12
Define variable constants let Let defines constants const Const defines variables Why not use VaR The simplest answer is that let provides block scoping, which is more refined than VaR’s function scoped control. Here is an example: Question: in the following example, please say the print result of the console. var callbacks = []; (function() […]
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Time：2021-6-12
catalogue Java basic syntax notes Single line comment// Multiline comments / **/ Document comments / * **/ identifier keyword Identifier considerations data type Strongly typed languages Weakly typed language Java data types are divided into two categories Primitive type Reference type Type conversion Casts (from high to low, for example: int – > byte) Automatic […]
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Time：2021-6-9
This article is first published on personal website:Let keyword: enhanced version of the VaR keyword Hello, uncle wants to chat with you about the new keywords in ES6 today——let. besidesletI want to talk to you about what you are right aboutletMy feelings——letIn fact, it’s the enhanced versionvar. Why do you say that? Don’t worry, and […]
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Time：2021-6-8
Chapter 13 Vue framework 13.1 ES6 ES6 is the abbreviation of ECMAScript 6.0, which is the next generation standard of JavaScript language. It has been officially released in June 2015. Its goal is to enable JS to easily develop large-scale enterprise applications. Therefore, some specifications of ES6 are gradually approaching back-end language standards such as […]
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Time：2021-5-12
An empty block is equivalent to an empty statement. The case tag must be an integer constant expression, and default is also a special case tag. Tags should not appear alone, it must be followed by a statement or another case tag. If a variable with an initial value is outside the scope somewhere and […]
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Time：2021-5-12
VaR, let keywords 1. The variable declared by VAR will become the local variable of the function containing it, which will be destroyed when the function exits. If you omit the VaR keyword, a global variable is created (not recommended). function test() { var message1 = “hi”; // local variable message2 = “hi”; // global […]
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Time：2021-5-10
I don’t need it for a while. I forget it soon. In order to make it convenient for you to recall quickly, I’d like to make a note of it. Remember how to use the grooved components first Out of date writingSuppose you have a base layout component with a header slot. We can use […]
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Time：2021-5-10
catalogue Introduction JS introduction history Basic grammar data type summary Null and undefined numerical value character string object function array This series is based on the experience of Ruan YifengIntroduction to JavaScript languageOr “JavaScript tutorial” records, the tutorial usesKnowledge sharing signature – same way sharing 3.0 protocol. This is almost one of the best tutorials […]
