Tyscript 使用Symbol时报错的原因

error TS2585: ‘Symbol’ only refers to a type, but is being used as a value here. Do you need to change your target library? Try changing the lib compiler option to es2015 or later.

原因:
Symbol是es6/es2015才出现的类型，需要将ts版本使用的js修改为es6
解决:
初始化ts,使之生成ts配置文件

tsc --init 

最后,将target改成es6即可