This point of the arrow Function

Document. onclick = function () {// This of a common function is temporarily bound during running. That is to say, the function is not running, you absolutely cannot know who this is. // if this function is called by yourself, this is a window. For example, 1 // if this function is called by another object, this is the object that calls him. For example, 2 function fn1 () {console. log (this)} // Case 1: fn1 (); // Case 2: button. onclick = fn1 (); // This of the arrow function is determined when it is created. // This of the arrow function depends on the scope of the function, // The following this is the name of the function outside, bound to this of the function outside, this is bound to document let FN2 = () => {console. log (this )}}

This point of the arrow Function