//根据标签名选择元素
function getByName(Name){
  var i = document.getElementsByName(Name);
  if(i>0){
    return i;
  }else{
    var aele = document.getElementsByTagName('*');
    var arr = [];
    for (var i = 0;i      if(aele[i].getAttribute("name")==Name){
        arr.push(aele[i]);
      }
    }
    return arr;
  }

}