console.log(screen.availWidth,screen.availHeight); // 获取屏幕的宽和高(除 Windows 任务栏之外))

console.log(screen.width,screen.height); // 获取屏幕的宽和高(包含Windows 任务篮));

console.log(window.innerWidth,window.innerHeight); // 浏览器窗口的宽高