目前想要运行ES6代码的话,可以用google/traceur-compiler将代码转译。点此访问traceur-compiler 在线版本时实编辑ES6代码并查看转换后的结果,代码运行结果会在console显示。
另外,关于Google Traceur,业界大神Addy Osmani利用前者写了个Chrome插件ES6 Tepl,安装后也可以进行ES6的测试。
当然,并不是所有ES6新特性都被实现了,所以上面的方法可以测试大部分,有一些还是无法测试的。
虽然ES6都还没真正发布,但已经有用ES6重写的程序了,各种关于ES789的提议已经开始了,这你敢信。潮流不是我等大众所能追赶的。
潮流虽然太快,但我们不停下学习的步伐,就不会被潮流丢下的,下面来领略下ES6中新特性,一堵新生代JS的风采。
箭头操作符
如果你会C#或者Java,你肯定知道lambda表达式,ES6中新增的箭头操作符=>便有异曲同工之妙。它简化了函数的书写。操作符左边为输入的参数,而右边则是进行的操作以及返回的值Inputs=>outputs。
我们知道在JS中回调是经常的事,而一般回调又以匿名函数的形式出现,每次都需要写一个function,甚是繁琐。当引入箭头操作符后可以方便地写回调了。请看下面的例子。
var array = [1, 2, 3]; //传统写法 array.forEach(function(v, i, a) { console.log(v); }); //ES6 array.forEach(v = > console.log(v));
大家可以打开文章开头提到的traceur在线代码转译页面输入代码来查看效果。
类的支持
ES6中添加了对类的支持,引入了class关键字(其实class在JavaScript中一直是保留字,目的就是考虑到可能在以后的新版本中会用到,现在终于派上用场了)。JS本身就是面向对象的,ES6中提供的类实际上只是JS原型模式的包装。现在提供原生的class支持后,对象的创建,继承更加直观了,并且父类方法的调用,实例化,静态方法和构造函数等概念都更加形象化。
下面代码展示了类在ES6中的使用。再次啰嗦一句,你可以将代码贴到traceur自己查看运行结果。
//类的定义 class Animal { //ES6中新型构造器 constructor(name) { this.name = name; } //实例方法
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