export const isDef = (input: unknown): boolean => typeof input !== 'undefined'

// eslint-disable-next-line @typescript-eslint/no-empty-function
export const NOOP = () => {}

export const getVcStr = (str, maxlength) => {
  /// 获得字符串实际长度，中文2，英文1
  /// 要获得长度的字符串
  const len = str.length
  let realLength = 0,
    charCode = -1,
    realStr = str
  for (let i = 0; i < len; i++) {
    charCode = str.charCodeAt(i)
    if (charCode >= 0 && charCode <= 128) realLength += 1
    else realLength += 2
    if (realLength > maxlength) {
      realStr = realStr.substr(0, i)
    }
  }
  return realStr
}