nl_tokens: 单元格展开图标
pl_tokens: function ( <mask> ) { var othis = $ ( this ) , elemCell = othis . children ( ELEM_CELL ) ; if ( hide ) { othis . find ( '.layui-table-grid-down' ) . remove ( ) ; } else if ( elemCell . prop ( 'scrollWidth' ) > elemCell . outerWidth ( ) ) { if ( elemCell . find ( '.' + ELEM_GRID_DOWN ) [ 0 ] ) return ; othis . append ( '<div class="' + ELEM_GRID_DOWN + '"><i class="layui-icon layui-icon-down"></i></div>' ) ; } }