d3
https://bl.ocks.org/mbostock/.

check that D3 can really

in addition, we see this implementation in Baidu Statistics . A raphaeljs is used. The effect is good, but I really don't know how to use it after looking at it. Can you let me know if you have used a big hand?

this is called area circle (hot area) chart. To put it bluntly, it maps the data into a proportional area unit, then calculates the corresponding radius drawing, and finally fills in different colors.