export default {
  /** 将平面树json转为带children的json
   * @param {Object} a
   * @param {Object} idStr
   * @param {Object} pidStr
   * @param {Object} childrenStr
   */
  transData(a, idStr, pidStr, childrenStr){
    var r = [], hash = {}, id = idStr, pid = pidStr, children = childrenStr, i = 0, j = 0, len = a.length;
    for(; i < len; i++){
      hash[a[i][id]] = a[i];
    }
    for(; j < len; j++){
      var aVal = a[j], hashVP = hash[aVal[pid]];
      if(hashVP){
        !hashVP[children] && (hashVP[children] = []);
        hashVP[children].push(aVal);
      }else{
        r.push(aVal);
      }
    }
    return r;
  },
  /**从字典缓存中返回数组用于页面上作下拉，
   * @param {Object} k 字典名称
   * @param {Object} v value取哪个字典属性
   * @param {Object} t
   */
  arrByDic(k,v,t){
    var map = uni.getStorageSync("dic");
    var  arr = map[k];
    var r = [];
    arr.forEach(obj=>{
      r.push({
        value: obj[v],
        text: obj[t]
      });
    })
    return r;
  },

  dateFmtyyyyMMddHHmmss(target) {
    let date = new Date(target);
    let y = date.getFullYear(); // 年
    let MM = date.getMonth() + 1; // 月
    MM = MM < 10 ? ('0' + MM) : MM;
    let d = date.getDate(); // 日
    d = d < 10 ? ('0' + d) : d;
    let h = date.getHours(); // 时
    h = h < 10 ? ('0' + h) : h;
    let m = date.getMinutes(); // 分
    m = m < 10 ? ('0' + m) : m;
    let s = date.getSeconds(); // 秒
    s = s < 10 ? ('0' + s) : s;
    return y + '-' + MM + '-' + d + ' ' + h + ':' + m + ':' + s;
  },
  // 比较时间大小
  compareDate(date1,date2){
    var oDate1 = new Date(date1);
    var oDate2 = new Date(date2);
    if(oDate1.getTime() > oDate2.getTime()){
      return true; //第一个大
    } else {
      return false; //第二个大
    }
  },
  uploadPreview(url, lists, name){
    var ext = url.substring(url.lastIndexOf(".")+1);
    ext = ext.toLowerCase();
    console.log(ext);
    if(ext=="pdf"){
      uni.navigateTo({
        url:"/pages/pdf/index?url=" + url
      })
    }
  }

}