[前端] html和原生js实现鼠标拖动和触摸拖动以及点击后跟随鼠标移动

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>悬浮窗拖动点击事件</title> <style> div { width: 100px; height: 100px; position: fixed; bo