function Recursion(node){
    var count=0;
    for (var key in node) {
      count++;
      var value = node[key];
      delete node[key];
      //如果node为叶子节点
      if (key.toString() == '$') {
        for (var attr in value)
          node[attr] = value[attr];
      } else {
        if (value instanceof Array) {
          if (value.length > 0) {
            node["children"] = value;
            for (var obj in value)
              Recursion(value[obj]);
          }
        }
      }
    }
    if(count==1)
      node["children"]=[];
}

function randomString(len) {
    len = len || 32;
    var $chars = 'abcdefhijkmnprstwxyz'; // 默认去掉了容易混淆的字符oOLl,9gq,Vv,Uu,I1
    var maxPos = $chars.length;
    var pwd = '';
    for (i = 0; i < len; i++) {
        pwd += $chars.charAt(Math.floor(Math.random() * maxPos));
    }
    return pwd;
}

exports.randomString=randomString;
exports.Recursion=Recursion;