This website is built according to the principles of web accessibility design.The website is mainly divided into four large sections
Accesskey of this website：
Alt+U： Menu link block, this block lists the main links of this website.
Alt+C： The central content area is the main content area of this page.
Alt+Z： Site information at the end of the page.
Quick key operation instructions：
Internet Explorer： Please use Alt plus shortcut key code operation.
Firefox： Please use Alt + Shift plus shortcut key code operation.
Google：If the operating system of Chrome is Windows, please use Alt plus shortcut code for operation, if it is Mac, use Alt + Option plus shortcut code for operation.
Safari：If the operating system is Windows, please use Alt plus the shortcut code for operation, if the operating system is Mac, use Alt + Option plus the shortcut code for operation.
When the item tabs of this website cannot be clicked by the mouse, you can browse the data with the following keyboard operations：：
← → or ↑ ↓：Press the left and right keys or the up and down keys to move the label sequence.
Home or End：You can jump directly to the first or last item of the label.
- 3 Historical Alerts
- 4Alert Types