解决jquery validate 验证不通过后验证正确的信息仍残留在label上的方法

showLabel: function( element, message ) {
      var place, group, errorID,
        error = this.errorsFor( element ),
        elementID = this.idOrName( element ),
        describedBy = $( element ).attr( "aria-describedby" );
      if ( error.length ) {
        // refresh error/success class
        error.removeClass( this.settings.validClass ).addClass( this.settings.errorClass );
        // replace message on existing label
        error.html( message );
      } else {
        // create error element
        error = $( "<" + this.settings.errorElement + ">" )
          .attr( "id", elementID + "-error" )
          .addClass( this.settings.errorClass )
          .html( message || "" );