CoffeeScript简介

代码从这里CoffeeScript: The beautiful way to write JavaScript抄来的

闲逛博客的时候看到这个东西，以前没听说过，看着挺好玩的，抄点代码，就算是简单介绍吧。

CoffeeScript很小的语言，用好看的方式写js，编译成js代码。项目地址：http://jashkenas.github.com/coffee-script/   

The golden rule of CoffeeScript is: "It's just JavaScript".

下面开始抄代码

CoffeeScript code:

square = (x) -> x * x
cube   = (x) -> square(x) * x

"Compiled" JavaScript code:

var cube, square;
square = function(x) {
  return x * x;
};
cube = function(x) {
  return square(x) * x;
};

ajax

CoffeeScript

get: (offset, callback, limit) =>
    data =
        project_id: Projects.getCurrent().id
        limit: limit or @default_limit

    if offset
        data.offset = Calendar.jsonFormat(offset, true)

    @ajax.getArchived(data, (data) =>
        if !offset
            @setCache(data)
        callback(data)
    )

js

get: function(offset, callback, limit) {
    var self = this;

    var data = {
        project_id: Projects.getCurrent().id,
        limit: limit || this.default_limit
    }

    if(offset)
        data.offset = Calendar.jsonFormat(offset, true);

    this.ajax.getArchived(data, function(data) {
        if(!offset)
            self.setCache(data);
        callback(data);
    });
},

继承

class Animal
    constructor: (@name) ->

    move: (meters) ->
        alert @name + " moved " + meters + "m."

class Snake extends Animal
    move: ->
        alert "Slithering..."
        super 5

一些特性

生成数组

countdown = (num for num in [10..1])

string interpolation不知道咋翻译，字符串里放变量

author = "Wittgenstein"
quote  = "A picture is a fact. -- #{ author }"

多行字符串

mobyDick = "Call me Ishmael. Some years ago -
never mind how long precisely -- having little
or no money in my purse, and nothing particular..."

用@表示this指针

Account = (customer, cart) ->
    @customer = customer
    @cart = cart

    $('.shopping_cart').bind('click', (event) =>
        @customer.purchase @cart
    )