<!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
     <title>获取div相对屏幕于左上角的绝对位置</title>
 </head>
 <body>
     <div class="div1"></div>
     <script>
         //返回值是一个包含width height top right bottom left的对象
         var rect = document.querySelector('.div1').getBoundingClientRect()
 　　　　 console.log(rect);
     </script>
 </body>
 </html>