CoffeeScript是逐句编译为JavaScript的一种小型语言，且没有运行时的解释器。 作为JavaScript的替代品之一，CoffeeScript旨在编译人类可读、美观优雅且速度不输原生的代码， 且编译后的代码可以在任何JavaScript运行时正确运行。
参阅 CoffeeScript官方网站以获取CoffeeScript的完整教程。
CoffeeScript是一种很潮的编程语言，它紧随众多现代编程语言的趋势。 因此正如Ruby和Python，CoffeeScript使用井号标记注释。
# 这是注释
###
大段落注释以此为例，可以被直接编译为 '/ *' 和 '* /' 包裹的JavaScript代码。
在继续之前你需要了解JavaScript的基本概念。
示例中 => 后为编译后的JavaScript代码
###
赋值
number = 42#=> var number = 42;
opposite = true#=> var opposite = true;
条件
number = -42 if opposite #=> if(opposite) { number = -42; }
函数
square = (x) -> x * x #=> var square = function(x) { return x * x; }
fill = (container, liquid = "coffee") ->
"Filling the #{container} with #{liquid}..."
#=>var fill;
#
#fill = function(container, liquid) {
# if (liquid == null) {
# liquid = "coffee";
# }
# return "Filling the " + container + " with " + liquid + "...";
#};
区间
list = [1..5] #=> var list = [1, 2, 3, 4, 5];
对象
math =
root: Math.sqrt
square: square
cube: (x) -> x * square x
#=> var math = {
# "root": Math.sqrt,
# "square": square,
# "cube": function(x) { return x * square(x); }
#}
Splats
race = (winner, runners...) ->
print winner, runners
#=>race = function() {
# var runners, winner;
# winner = arguments[0], runners = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
# return print(winner, runners);
#};
存在判断
alert "I knew it!"if elvis?
#=> if(typeof elvis !== "undefined" && elvis !== null) { alert("I knew it!"); }
数组推导
cubes = (math.cube num for num in list)
#=>cubes = (function() {
# var _i, _len, _results;
# _results = [];
# for (_i = 0, _len = list.length; _i < _len; _i++) {
# num = list[_i];
# _results.push(math.cube(num));
# }
# return _results;
# })();
foods = ['broccoli', 'spinach', 'chocolate']
eat food for food in foods when food isnt 'chocolate'
#=>foods = ['broccoli', 'spinach', 'chocolate'];
#
#for (_k = 0, _len2 = foods.length; _k < _len2; _k++) {
# food = foods[_k];
# if (food !== 'chocolate') {
# eat(food);
# }
#}
