CoffeeScript风格代码

coffeeScript风格的代码

cc.Class {
    extends: cc.Component
    properties: {
        # foo:
        #   default: null      # The default value will be used only when the component attaching
        #                        to a node for the first time
        #   type: cc
        #   serializable: true # [optional], default is true
        #   visible: true      # [optional], default is true
        #   displayName: 'Foo' # [optional], default is property name
        #   readonly: false    # [optional], default is false
    }
    update: (dt) ->
        # do your update here
}

Coffee大量借鉴了Ruby和Python的语法
原始的coffeeScript写法

# 赋值:
number   = 42
opposite = true

# 条件:
number = -42 if opposite

# 函数:
square = (x) -> x * x

# 数组:
list = [1, 2, 3, 4, 5]

# 对象:
math =
  root:   Math.sqrt
  square: square
  cube:   (x) -> x * square x

# Splats:
race = (winner, runners...) ->
  print winner, runners

# 存在性:
alert "I knew it!" if elvis?

# 数组 推导(comprehensions):
cubes = (math.cube num for num in list)

输出的JavaScript语法

var cubes, list, math, num, number, opposite, race, square,
  __slice = [].slice;

number = 42;

opposite = true;

if (opposite) {
  number = -42;
}

square = function(x) {
  return x * x;
};

list = [1, 2, 3, 4, 5];

math = {
  root: Math.sqrt,
  square: square,
  cube: function(x) {
    return x * square(x);
  }
};

race = function() {
  var runners, winner;
  winner = arguments[0], runners = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
  return print(winner, runners);
};

if (typeof elvis !== "undefined" && elvis !== null) {
  alert("I knew it!");
}

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;
})();

但是es6应该会成为主流，coffeeScript会被慢慢废弃