**关于随机数生成的案例**

关于随机数生成的案例

需求：该函数接收一个布尔类型参数，表示颜色的格式是十六进制的还是rgb格式 如下：

1. 分析：十六进制格式为 “#ffffff”，f要循环0-f之间的字符，用到的是数组 let arr =["0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"] 2. rgb颜色格式是“rgb(255,255,255)”,是0-255之间的随机数