jeyvie / understanding-es6 Goto Github PK
View Code? Open in Web Editor NEWreminders of es6
reminders of es6
解构支持哪些对象
经验证,除了 数组,对象,还有字符串,NodeList
const [fistChar] = 'abc'
console.log(fistChar) // 'a'
const set = new Set([1, 2])
const [a] = set;
console.log(a) // 1
const map = new Map([['a', 1], ['b', 3]])
const [item] = map;
console.log(item) // ['a', 1]
ES5
语法糖new
调用new
extends
关键字后可以跟表达式函数里,argumments 会和 有名参数的改变同步,但默认参数,会使得这一功能失效
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