//如果是5.00之类的，转换后，应该不要小数点后的位数

let num = 5.34;

//let num = 5.00;

let arr = num .toString().split(".");

let len = 0;

if (num[1]) {

    len = Number(num[1]) == 0 ? 0 : num[1].length;

}

num = len == 0 ? Number(num ).toFixed(0) : Number(num ).toFixed(2);