Coffeescript Grammar Summary

Coffeescript

----> Install node. js

----> Installation Coffeescript

　　Statement:

Note: There is no semicolon, the statement ends with a new line; multiple statements written to the same row require semicolons to denote the end of a statement (not commonly used);

Continuation to the next line by adding \ Representation statements at the end of a row;

　　Variable:

Unlike JS, coffeescript variables do not need to be defined, and all variables are local variables by default.

Declaring global variables: global.myglobalvariable= "I am calamus!"

Replace with Window object in browser: window.myglobalvariable= "I am calamus!"

　　Comments:

Single-line comment (does not exist after compilation): Begins with #, and the content after the # in the middle of the line is also the comment content.

#注释内容;

Multiline comments (rarely used, compiled to JS after/**/): # # #开头和结尾的注释块

###

Comment Block Contents

###

　　function Call :

The priority of the function call: The parameter is assigned to the function from inside out, that is, the recent principle.

Console.log ("Hello,calamus!"  "Hello,calamus!" // the parentheses can be omitted if there are parameters, but sometimes a practical parenthesis is required to disambiguate Math.pow 2,3// call function without arguments, must be practical parentheses date.now ()

　　control Structure : Not practical curly braces, using indentation control code execution

　　　　If , else, and else if statements :

Calamus=16; if calamus>5    "Calamus is greater than 5"    if calamus>15         " Calamus is greater than 5 "     

Single-line form:

if true= =true

　　　　unless statement (the branch statement block is executed when the test condition is an equivalent false value):

Day= "Monday"unless day[0]== "S"    "Today is a weekday!" //The compiled JS code is: var day;day= "Monday"; if (day[0]!== "S") {    "today is a weekday!" }

　　Switch statement:

// compile to JS will add break Switch things    " Ice "            white" "Grass" then  console.log "green"  //  can also be useful then shorten the statement to one line    else         "Gray"

　　comparison operators :

Coffeescript and JavaScript comparison operator conversions

Coffeescript	Javascript
is,==	===
Isnt	!==
Not	!
and	&&
Or	||
True,yes,on	True
False,no,off	False
@,this	This
Of	Inch
Inch

　　Array:

Languages =["中文版", "Chinese", "French"=[  "English",                    "Chinese",                    "French "]  // not practical comma can also languages =[  " English "                    " Chinese ""                    French "]      

　　Sequence:

NUM=[0..9]            // compile to num=[0,1,2,3,4,5,6,7,8,9]; NUM=[0...9]          // compile to num=[0,1,2,3,4,5,6,7,8]; three points with no trailing boundaries

　　Simple objects:

Author={name: "Calamus", age:21}  // can omit comma, curly brace (indent)author.nameauthor["age"] Author.favoritecolor= "BLACK"// object traversal for   k,v of author    "My" +k+ "is" +v

　　Cycle:

// It is convenient to iterate through each element of the array animals=["dog", "cat", "Brid"] for in animals    Console.log Animal

　　Function:

Anonymous functions:

// parameter is an anonymous function with name, or it can have multiple arguments. (name),    return "hello,#{name}!" // after compilation (function(name) {    return "Hello", "+name+"! " ;    }) // function call sayhello= (name),    return "hello,#{name}!"  "Calamus"

Named functions: Most of the cases do not support named functions, the main reason is that IE's support for named functions is very weak, but can be used to bind a variable with a way to name the function

return value of the function

// If the function does not have an explicit return value, the last sentence is treated as the return value of the function about = (phrase),    "{phrase.touppercase ()}!!!"    // Return to   confirm that no return value is added    // null     implicitly returns // compiled jsvarfunction  (phrase) {    return "" + (Phrase.touppercase ()) + "!!!" ;}

　　Class:

// declaration of a class Class Rabbit // create an instance of the class rabbit=new  Rabbit () rabbit.color= "Gray"// to the class binding method, number is the parameter  Class Rabbit Jump    : (number)        --"Grayrabbit"rabbit.jump ()

constructor function:

// just add constructor in front class Rabbit    constructor: (Num,type= "Diesel"),        @type=type;        @number=number        @load=0        @capacity=number *              Other content

Inheritance of the class:

// practical extends indicates inheritance relationship Class Animal         "Jump" class Rabbit extends animal//instance New Rabbit ()         Myrabbit.behavior ()

　　　　　

Coffeescript Grammar Summary