layer关闭特定某一个窗口

$("#btn_close").click(function () {
            var $t = parent.$(".layui-layer-title");
            $t.each(function (k,c) {
                if ($(c).html() == "导入书签") {
                    var as = $(c).siblings(".layui-layer-setwin").find("a");
                    as.each(function (m, n) {
                        n.click();
                    });
                }
            });
        });

 layer.open({
                    title:'导入书签',
                    type: 2,
                    area: ['400px', '200px'],
                    fixed: false, //不固定
                    maxmin: false,
                    content: '/bookmarks/import'
                });