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 || "" );