为什么打印a为12？

Question

var a = 10;
    {
        a = 11
        function a() {}
        a = 12
        function a() {}
        a = 15
    }
    console.log('a: ',a)

Answer 1

这个问题出现很多次了
https://segmentfault.com/q/10...
https://segmentfault.com/a/11...
https://segmentfault.com/q/10...