laravel框架上传图片实现实时预览功能

<img class="pic house-a" οnclick="houseImgOne(this)" name="house_img_one" id="house_img_one" src="">
<input type="file" name="house_img_one" id="house_img_one1" multiple="multiple" style="display:none;">

 public function upload($photo)
  {
    $file_ex = $photo->getClientOriginalExtension();
    if (!in_array($file_ex, array('jpg', 'gif', 'png', 'jpeg'))) {
      echo "<script>alert('文件格式错误,仅支持 jpg ,gif,png,jpeg');location.href='/apply'</script>";
    }
    $newname = date('Ymdhis') . rand(1, 999) . "." . $file_ex;
    $savepath = config('constants.img_uf') .'Uploads/Apply/';
    $path = $photo->move($savepath, $newname);
    $filepath = "UF/Uploads/Apply/" . $newname;
    return $filepath;
  }

var _btnId = '';
function houseImgOne(_this){
  _btnId = $(_this).attr('id');
  $('#house_img_one1').click();
  $("#house_img_one1").change(function () {
    var objUrl = getObjectURL(this.files[0]); //获取图片的路径，该路径不是图片在本地的路径
    if (objUrl) {
      $("#" + _btnId).attr("src", objUrl); //将图片路径存入src中，显示出图片ai
    }
  });
}
/建立一个可存取到该file的url
function getObjectURL(file) {
  var url = null;
  if (window.createObjectURL != undefined) { 
    url = window.createObjectURL(file);
  } else if (window.URL != undefined) { 
    url = window.URL.createObjectURL(file);
  } else if (window.webkitURL != undefined) { 
    url = window.webkitURL.createObjectURL(file);
  }
  return url;
}