蒋小花

![image.png](https://p1-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/dcdf83c3aad7436d881b904...

`var num = 20; function fun() { console.log(num); var num = 10; } fun(); var x = 1; fu...

`function aun() { // x = 20; return x(); function x() { console.log('xx'); } } let aa ...

`(function() { var str; console.log(str); str = 'inner'; })();`...

`let obj1 = {a: 1}, obj2 = {b: 2}; let obj3 = {}; Object.assign(obj3, obj1, obj2)...