async queryUserByChunk(search) {
  clearTimeout(this.timeout) // this.timeout 是一个全局变量
  let param = {
    corporationNo: localStorage.getItem("orgAcct"),
    searchParam: search
  };
  this.timeout = setTimeout(() => {
    findUserByUsernameOrRealNameOrJobNo(param)
      .then(res => {
        // do some thing...
      })
      .catch(error => {});
  }, 300);
}