结论：const定义的基本类型不能改变，但是定义的对象是可以通过修改对象属性等方法来改变的。

例子：

1.

const aa=trueaa=falseconsole.log(aa)VM1089:2 Uncaught TypeError: Assignment to constant variable.2.const aaa=3aaa=5console.log(aaa)VM1152:2 Uncaught TypeError: Assignment to constant variable.3.const aaaa='ss'aaaa='dd'console.log(aaaa)VM1194:2 Uncaught TypeError: Assignment to constant variable.4.const aaaaa={aa:'dd'}aaaaa={aa:'bb'}console.log(aaaaa)VM1257:2 Uncaught TypeError: Assignment to constant variable.5.const aaaaaa={aa:'dd'}aaaaaa.aa='bb'console.log(aaaaaa)//output:

 {aa: "bb"}