Property ‘startsWith‘ does not exist on type ‘string‘.

 ts运行出现下面报错：

Property 'startsWith' does not exist on type 'string'. Do you need to change your target library? Try changing the 'lib' compiler option to 'es2015' or later

解决方法：

找到项目里tsconfig.json文件，

在compilerOptions下的lib里加入“ES2015”，就可以解决。