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ES6 arrow function

2022-06-30 06:04:00 【SignalFire】

1、this Point to the default object at the time of the call

In the arrow function this Point to the object where it was defined

<!DOCTYPE html>
<html>
   <head>
       <meta charset="utf-8">
       <title></title>
   </head>
   <body>
       <button id="btn">button</button>
   </body>
   <script>
       let btn = document.querySelector("#btn");
       btn.addEventListener('click',function(){
           setTimeout(() => {
               console.log(this);
           },1000);
       })

   </script>
</html>