字符串截取最后一个" . "或者最后一个" / " 之后的字符

常用于截取文件名,或者文件后缀

      let lis = res.data.data.rows
      for (let i = 0; i < lis.length; i++) {
        const splitArray = lis[i].projectFileStr.split('/')
        const substring = splitArray[splitArray.length - 1]
        lis[i].name = substring
        const Arrays = lis[i].projectFileStr.split('.')
        const substr = Arrays[Arrays.length - 1]
        console.log(substr)
        lis[i].format = substr
      }
      list.value = lis

//示例

let string = 'yellow.png'

const Arrays =string.split('.')

const substr = Arrays[Arrays.length - 1]

console.log(substr) //打印出来 'png'