One minute to understand JavaScript this points to the problem

On Javascript The this point of the problem, there are many analytical articles on the network, written very well, such as here and here

I'm here to make a brief summary.

This of the arrow functions

The scope within the arrow function that this points to the outer function definition . If there is no outer function, point to the global scope.

ES5 's This

ES5That this points to the context in which the current function is executing .

Note: Call the normal function, which this points to the global scope.

What is a normal function?

// 这就是funtion a() {console.log(this)}

One minute to understand JavaScript this points to the problem