$(document).on('change', '.photo-box .file', function () {

  //alert($(this).val());

  function getObjectURL(file) {

    var url = null;

    if (window.createObjectURL != undefined) { // basic

      url = window.createObjectURL(file);

    } else if (window.URL != undefined) { // mozilla(firefox)

      url = window.URL.createObjectURL(file);

    } else if (window.webkitURL != undefined) { // webkit or chrome

      url = window.webkitURL.createObjectURL(file);

    }

    return url;

  }

  var objUrl = getObjectURL(this.files[0]);

  console.log("objUrl = " + objUrl);

  var html = '<div class="photo-box"><img src="' + objUrl + '" alt=""><div class="photo-btn"><p>删除</p></div></div>';

  $(this).parent().parent().append(html);

})