export const registAttrFun = (Element) => {
  Element.registerFunction('attr', function (key, value) {
    var self = this;
    if (BI.isObject(key)) {
      BI.each(key, (k, v) => {
        self.attr(k, v);
      });
      return this;
    }
    if (BI.isNull(value)) {
      return this.attribs[key];
    }
    this.attribs[key] = value;
    return this;
  });
  Element.registerFunction('hasAttrib', function (key) {
    return this.attribs[key] != null;
  });
  Element.registerFunction('removeAttr', function (key) {
    delete this.attribs[key];
  });
};