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102 lines
2.7 KiB
Markdown
102 lines
2.7 KiB
Markdown
---
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language: coffeescript
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contributors:
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- ["Tenor Biel", "http://github.com/L8D"]
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- ["Xavier Yao", "http://github.com/xavieryao"]
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translators:
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- ["Xavier Yao", "http://github.com/xavieryao"]
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filename: coffeescript-cn.coffee
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lang: zh-cn
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---
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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。
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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，
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且编译后的代码可以在任何JavaScript运行时正确运行。
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参阅 [CoffeeScript官方网站](http://coffeescript.org/)以获取CoffeeScript的完整教程。
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``` coffeescript
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# CoffeeScript是一种很潮的编程语言，
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# 它紧随众多现代编程语言的趋势。
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# 因此正如Ruby和Python，CoffeeScript使用井号标记注释。
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###
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大段落注释以此为例，可以被直接编译为 '/ *' 和 '* /' 包裹的JavaScript代码。
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在继续之前你需要了解JavaScript的基本概念。
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示例中 => 后为编译后的JavaScript代码
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###
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# 赋值:
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number = 42 #=> var number = 42;
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opposite = true #=> var opposite = true;
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# 条件:
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number = -42 if opposite #=> if(opposite) { number = -42; }
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# 函数:
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square = (x) -> x * x #=> var square = function(x) { return x * x; }
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fill = (container, liquid = "coffee") ->
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"Filling the #{container} with #{liquid}..."
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#=>var fill;
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#
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#fill = function(container, liquid) {
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# if (liquid == null) {
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# liquid = "coffee";
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# }
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# return "Filling the " + container + " with " + liquid + "...";
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#};
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# 区间:
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list = [1..5] #=> var list = [1, 2, 3, 4, 5];
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# 对象:
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math =
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root: Math.sqrt
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square: square
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cube: (x) -> x * square x
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#=> var math = {
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# "root": Math.sqrt,
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# "square": square,
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# "cube": function(x) { return x * square(x); }
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#}
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# Splats:
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race = (winner, runners...) ->
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print winner, runners
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#=>race = function() {
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# var runners, winner;
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# winner = arguments[0], runners = 2 <= arguments.length ? __slice.call(arguments, 1) : [];
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# return print(winner, runners);
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#};
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# 存在判断:
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alert "I knew it!" if elvis?
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#=> if(typeof elvis !== "undefined" && elvis !== null) { alert("I knew it!"); }
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# 数组推导:
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cubes = (math.cube num for num in list)
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#=>cubes = (function() {
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# var _i, _len, _results;
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# _results = [];
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# for (_i = 0, _len = list.length; _i < _len; _i++) {
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# num = list[_i];
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# _results.push(math.cube(num));
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# }
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# return _results;
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# })();
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foods = ['broccoli', 'spinach', 'chocolate']
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eat food for food in foods when food isnt 'chocolate'
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#=>foods = ['broccoli', 'spinach', 'chocolate'];
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#
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#for (_k = 0, _len2 = foods.length; _k < _len2; _k++) {
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# food = foods[_k];
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# if (food !== 'chocolate') {
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# eat(food);
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# }
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#}
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```
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