About two decimal places js Methods

https://www.cnblogs.com/le220/p/9756881.html
https://blog.csdn.net/hyb1234hi/article/details/84142721
https://www.jb51.net/article/134067.htm
https://segmentfault.com/q/1010000015323261/a-1020000015323671

Classic two decimal places: (Math.round (5.1699 * 100) / 100) .toFixed (2)