Question

Answer 1

你可以在最后摆脱半冒号，也摆脱了大量的括号和花括号。

Green5 =
    getLevel: -> @options.level
    setLevel: (x) ->
        greenlevels = @options.greenlevels;
        level = Math.floor Math.min greenlevels.length-1, Math.max 0,x
        @options.level = level
        @element.css background: greenlevels[level]
        @_trigger 'change', 0, level
    _init: -> @setLevel this.getLevel() # grab the default value and use it
    darker: -> @setLevel this.getLevel() - 1
    lighter: -> @setLevel this.getLevel() + 1
    off: ->
        @element.css background: 'none'
        @_trigger 'done'
        @destroy() # use the predefined function
    options: level: 15, greenlevels: ['#000','#010','#020','#030','#040','#050','#060','#070','#080','#090','#0a0','#0b0','#0c0','#0d0','#0e0','#0f0', '#fff']

$.widget "ui.green5", Green5

但是，语法糖并不是CoffeeScript的唯一好处。一个很大的优点是它将某些代码结构重写为更好的javascript。

例如：

yearsOld = max: 10, ida: 9, tim: 11

ages = for child, age of yearsOld
  child + " is " + age

变为：

var age, ages, child, yearsOld;
yearsOld = {
  max: 10,
  ida: 9,
  tim: 11
};
ages = (function() {
  var _results;
  _results = [];
  for (child in yearsOld) {
    age = yearsOld[child];
    _results.push(child + " is " + age);
  }
  return _results;
})();

变量全部被正确声明，并且在ages for loop周围自动添加了一个闭包，这个闭包是用良好的javascript技术编写的，这显然是非常难以阅读。

如何改进用CoffeeScript编写的Jquery Widgets？

1 个答案: