let - MDN - Mozilla
文章推薦指數： 80 %
let用於宣告一個「只作用在當前區塊的變數」，初始值可選擇性的設定。
The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.let 可以宣告只能在目前
