Welcome to 16892 Developer Community-Open, Learning,Share
menu search
person
Welcome To Ask or Share your Answers For Others

Categories

let userName = 'John';

function showMessage() {
  let message = 'Hello, ' + userName;
  alert(message);
}

showMessage(); // Hello, John

问下各位大神,这里的 userName 是在最外层用let 定义的,但在showMessage()函数内却可以访问。
在这里跟用var 定义的就没有区别了是吗?

另外,试了下window.userName却无法访问。。。

谢谢~


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
thumb_up_alt 0 like thumb_down_alt 0 dislike
618 views
Welcome To Ask or Share your Answers For Others

1 Answer


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
thumb_up_alt 0 like thumb_down_alt 0 dislike
Welcome to 16892 Developer Community-Open, Learning and Share
...