树莓派4 配置如下：
这次的更新，主要体现在以下十大方面：

1、采用四核 64 位的 ARM Cortex-A72 架构 CPU，型号为博通 BCM2711 SoC，主频达 1.5GHz，与上一代相比性能提升 3 倍。

2、可选 1G、2G 或 4G 的 LPDDR4 内存。

3、千兆以太网

4、双频 802.11ac 无线网络

5、蓝牙 5.0 技术

6、配备了两个 USB 3.0 和两个 USB 2.0 端口

7、支持双显示器，分辨率高达 4K

8、VideoCore VI GPU，支持 OpenGL ES 3.x

9、支持硬件解码 4K60p 的 HEVC 视频

10、兼容此前发布的树莓派

与上一代产品树莓派 3B+ 相比，有直接且明显的提升。

售价情况

RAM Retail price
1GB $35
2GB $45
4GB $55

需要的小伙伴激动起来吧。

官方介绍链接：https://www.raspberrypi.org/blog/raspberry-pi-4-on-sale-now-from-35/

现在的浏览器打开1-2个标签就耗费600+M 内存，低配电脑伤不起哈。试了其他几种，如遨游、世界之窗等，要么有点兼容性不好，要么新版本资源占用也很高，后来发现360极速浏览器8.5还不错，关键是找到了官方下载链接，使用起来也安全放心

8.5 版本最大的变化是我们升级到了Chromium 45 内核。而45内核最大的变化就是对 HTTP/2 标准和 Javascript ES6 标准的支持。

HTTP/2是下一代的超文本传输协议的最新标准，这是时隔16年，互联网最重要最基础的通用传输协议做的一次重大更新。新协议摒弃了 HTTP 1.0 冗余，低效，高负载和安全性弱的缺点，做了很多底层架构的改革和创新。最大的特点就是消息多路复用，HEAD头压缩，服务器推送机制和消息优先级排序等特性，这些特性将极大的改善用户的网络访问速度。

官方下载链接：http://down.360safe.com/cse/360cse_8.5.0.142.exe

On June 20th, Beijing time, after Xiaomi exposed the news of poster plagiarism, Xiaomi immediately issued a statement saying that the poster had been deleted from the official website and the relevant designers were expelled. Xiaomi also said that it will strengthen the company's internal approval process of art works to prevent such incidents from happening again.

Previously, Xiaomi's official website in Spain released some publicity maps. However, some of the eye-catching Spanish media have seen at a glance that one of these propaganda pictures is a copy of the work of the 3D artist Peter Tarka.

Taka created the work in May 2018, but Xiaomi was never authorized to use his work, nor did he commission him to create. He said: "I am 100% certain that they used my work, because everything is very matching, they only changed the saturation, and modified some elements to make it less obvious." Obviously, Xiaomi infringed this time.

在属性文件中定义session.timeout=：

server.port=8080
server.servlet.session.timeout=60m

测试验证，在登录后的controll中输出超时时间：

HttpServletRequest request = ((ServletRequestAttributes)(RequestContextHolder.getRequestAttributes())).getRequest();
int maxInactiveInterval= request.getSession().getMaxInactiveInterval();

核心方法：

clearQueue
Method Call'clearQueue'
Remove all items from the file queue.

如点击事件：

<a href="javascript:$('#file_upload').uploadifive('clearQueue')">Clear Queue</a> 

常用的是在 onUploadComplete 后面执行，

'onUploadComplete' : function(file, data) {
            $(this).uploadifive('clearQueue'); 
  }