前端需要了解下的知识点

ajax
html
css
js/jque
canvas
svg
echars
https://www.echartsjs.com/examples/zh/index.html#chart-type-pie

//seclet文件传输
https://www.cnblogs.com/fogcell/p/6776139.html
https://www.cnblogs.com/EasonJim/p/6977597.html