Ts报错:Type ‘Function | undefined‘ is not assignable to type ‘Function‘；Cannot invoke an object
报错Type ‘Function | undefined’ is not assignable to type ‘Function’.Type ‘undefined’ is not assignable to type ‘Function’.意思是：类型’Function | undefined’不能赋值给类型’Function’。类型’undefined’不能赋值给类型’Function’。解决：将类型定义为Function | undefined const myFun: Function
