需求实现：仅支持中英文和数字，且字数不超过8个汉字或16个字母

[54leibo]

/**
  * @method processStr
  * @params {String} val
  * @return {String} val
*/
const processStr = val => {
      val = val.replace(/[^a-z0-9\u4e00-\u9fa5]/ig, '')
      const getLen = () => val.length + val.replace(/[^\u4e00-\u9fa5]/ig, '').length
      let mixLen = getLen()

      while (mixLen > 16) {
        val = val.slice(0, val.length - 1)
        mixLen = getLen()
      }

     return val
}