如何保留两位小数

parseFloat (推荐)

n = 2.344444
parseFloat(n.toFixed(2)) // 2.34
n = 2.3034444
parseFloat(n.toFixed(2))  // 2.3

x 100 / 100

n = 2.344444
n.toFixed(2) * 100 / 100 // 2.34
n = 2.3034444
n.toFixed(2) * 100 / 100  // 2.3

parseInt和parseFloat的区别

https://blog.csdn.net/wu_xianqiang/article/details/79672339