1. I think using iframe to layout can do local refresh, the page experience is better, why this is not good.
2. Why is it better to use div for layout? With DIV layout, each click of a menu button refreshes the entire page. If the menu bar data on the left side of the background is fetched from the database, then if you use DIV to layout, click a menu button to refresh the entire page and fetch data from the data every time. This will not affect the web page request
.I know that with DIV layout, you can load the pages you need asynchronously, but I see that many foreign background management UI frameworks refresh the whole page
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