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4、概述 Overview ECMAScript is an object-oriented programming language for performing computations and manipulating computational objects within a host environment. ECMAScript was originally designed to be used as a scripting language, but has become widely

ECMAScript 2015 Features - Babel 1. 箭头函数和this Unlike functions, arrows share the same lexical _this _as their surrounding code. If an arrow is inside another function, it shares the "arguments" variable of its parent function. 箭头函数中的this和arguments参数和普通函数