### 1. 可视区域的width,height ~~~ <script> // 可视区域的width,height var ww = window.innerWidth; var wh = window.innerHeight; var dw = document.documentElement.clientWidth; var dh = document.documentElement.clientHeight; console.log(wh); console.log(ww); console.log(dh); console.log(dw); </script> ~~~