UE.parse.register("background", function(utils) {
  var me = this,
    root = me.root,
    p = root.getElementsByTagName("p"),
    styles;

  for (var i = 0, ci; (ci = p[i++]); ) {
    styles = ci.getAttribute("data-background");
    if (styles) {
      ci.parentNode.removeChild(ci);
    }
  }

  //追加默认的表格样式
  styles &&
    utils.cssRule(
      "ueditor_background",
      me.selector + "{" + styles + "}",
      document
    );
});