ES6-新增特性一览
  # # ES6-新增特性一览
ecma-263 (opens new window) (opens new window)是ES6规范的官网文档,该文档是英文版,而且里面洋洋洒洒写了每个特性的实现步骤,容易看晕。这里推荐@阮一峰老师的ECMAScript 6 入门 (opens new window) (opens new window)和es6features (opens new window) (opens new window)项目,以下每个特性详细案例描述也是外链该项目内容。
以下默认陈述的是ES6标准,部分标注ES7、ES8标准是为了表明其最终发布时间(严谨)。其实大部分在2015年6月(ES6发布时间)都进入了草案阶段(Stage 2),故在babel等转译工具下,都可以使用这些特性在前端工程项目中。
# # 1. let/const取代var (opens new window) (opens new window)
# # 2. 字符串模板 (opens new window) (opens new window)
# # 3. 对象解构 (opens new window) (opens new window)
- Destructuring
 - enhanced object literals({foo} === {foo:foo})
 
# # 4. 新数据类型Symbol (opens new window) (opens new window)
# # 5. 新数据结构Map/Set/WeakMap/WeakSet (opens new window) (opens new window)
# # 6. Proxy (opens new window) (opens new window)、Reflect
# # 7. 扩展
- Array
- Array.from()
 - Array.of()
 - Array.copyWithin()
 - Array.find()
 - Array.findIndex()
 - Array.fill()
 - Array.includes()
ES7 
 - Object
- Object.keys()
 - Object.values()
ES8 - Object.entries()
ES8 - Object.assign()
 - Object. is()
 
 - Function 
- default
 - arraw function (opens new window) (opens new window)
 - ...rest运算符
 
 - Number
- Number.isNuN()
 - Number.isFinite()
 - Number.parseInt()
 - Number.parseFloat()
 - Number.isInteger()
 - Number.isSafeInteger()
 
 - Math
- Math.max(x, y)
 - Math.trunc(x)
 - Math.sign(x)
 - Math.acosh(x)
 - Math.asinh(x)
 - Math.atanh(x);
 - Math.cbrt(x)
 - Math.clz32(x)
 - Math.cosh(x)
 - Math.expm1(x)
 - Math.fround(x)
 - Math.hypot(...values)
 - Math.imul(x, y)
 - Math.log1p(x)
 - Math.log10(x)
 - Math.log2(x)
 - Math.tanh(x)
 
 
# # 8. 异步
- Promise (opens new window) (opens new window) 
- Promise.prototype.then
 - Promise.prototype.catch
 - Promise.prototype.finally
ES9 - Promise.all()
 - Promise.rece()
 
 - Iterator (opens new window) (opens new window) 
- Iterator接口
 - for of
 
 - Generator (opens new window) (opens new window) 
- yield*
 
 - async/await
ES8 
# # 9. Class类 (opens new window) (opens new window)
- class
 - extends
 - decorator
ES7 
# # 10. Module (opens new window) (opens new window)
- import
 - export
 
# # 参考文档
编辑  (opens new window)