JavaScript specification of web front end

JavaScript language 2020-11-13 05:03:56
javascript specification web end


JavaScript It's a weak type language , That's why it's written in a variety of ways , Here are some things to pay attention to when writing code

General specifications

File encoding

In order to avoid the content garbled , Unified use UTF-8 Encoding preservation .

At the end of the file , Leave a blank line .

code detection

Turn on eslint Code specification and error checking .

Code in strict mode mode

'use strict';

Type specification

  • js The data types are string、number、boolean、null、undefined、array、function and object These kinds of , Different data types have different storage methods , There are different ways to use it , Pay attention to the following points for data assignment

    • The initial value type should be clear
    • Don't change the type at will
  • Type detection priority of use typeof. Object type detection uses instanceof.null or undefined Detection and use of == null.

  • Use single quotation marks at the beginning and end of a string '...string...'

Naming specification

  • The variable is named by a small hump , Such as :addUser password studentID

  • Constant names are capitalized with all letters of the word , And underline it , Such as :FORM_NAME

  • For the object 、 function 、 And the example uses the small hump (camelCase) Nomenclature

    // object
    let isObject = {};
    // function
    function isFun(){
    ...
    };
    // example
    let myBbj = new Object();
    web Front end development resources Q-q-u-n: 767273102 , There are free development tools , Zero basis , Advanced video tutorial , I hope novices don't take detours
    

* For class naming or constructors , Named after the great hump User() DateBase()
```
// class
class Point {
...
};
// Constructors
function User(options) {
this.name = options.name;
}
let myBbj = new User({
name: 'yup'
});
```
## Code specification
### Indent
Unified use ` Two spaces indented `, It is not recommended to use tap Indent .
### quotes
Unified use ` Single quotation marks `.
### Line break
Each individual statement must wrap at the end of each sentence .
### A semicolon
Do not omit the semicolon at the end of a statement
### Code block
Wrap all the multiline blocks with curly braces .
* A single if Statements must also be enclosed in curly brackets *

// recommend
if (true) {
// TODO …
}


// Not recommended
if (true) // TODO …


### Use congruent symbols
Use strictly typed... In equal sign expressions `===` and `!==`. Use === It can avoid the implicit type conversion in the judgment .

// recommend
if (age === 30) {
// …
}


// Not recommended
if (age == 30) {
// …
}


## Annotation specifications
### Single-line comments
Use `//` As a single line comment . Use a single line comment on the comment object . Insert a space before the comment .

// Single-line comments


### Multiline comment
With `/*` start ,`*/` ending , Add a space before and after the comment

/*

  • The first line notes
  • Second line of notes
    */

/* Another way of writing */


### Method notes
function ( Method ) Comments are also a kind of multiline comments , But there are special annotation requirements , Key methods must be annotated .

/**

  • Method function description
  • @param {*} Parameters
  • @param {*} Parameters
  • @param {*} Parameters
  • @param {*} Parameters
  • @return Return value
    */
    web Front end development resources Q-q-u-n: 767273102 , There are free development tools , Zero basis , Advanced video tutorial , I hope novices don't take detours

### TODO notes
Use // TODO: Mark the solution to the problem .

function Calculator() {
// TODO: total should be configurable by an options param
}


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