掘友等级
获得徽章 8
大佬们，你们看这个变量提升题，想了好久想不明白![[捂脸]](//lf-web-assets.juejin.cn/obj/juejin-web/xitu_juejin_web/img/jj_emoji_28.8981538.png)
var a = 0;
console.log(a, window.a);
if (true) {
console.log(a, window.a);
a = 10;
console.log(a, window.a);
function a() {}
console.log(a, window.a);
a = 20;
console.log(a, window.a);
}
console.log(a, window.a);
#新人报道# 周四到了，周五还会远吗![[不失礼貌的微笑]](//lf-web-assets.juejin.cn/obj/juejin-web/xitu_juejin_web/img/jj_emoji_16.9d17f6d.png)
![[捂脸]](http://lf-web-assets.juejin.cn/obj/juejin-web/xitu_juejin_web/img/jj_emoji_28.8981538.png)
![[不失礼貌的微笑]](http://lf-web-assets.juejin.cn/obj/juejin-web/xitu_juejin_web/img/jj_emoji_16.9d17f6d.png)