$.modal只保留一个【关闭】按钮

//modal弹框按钮设置
var options = {
    title: '详情',
    width: "900",
    height: "520",
    url: "/ywgl/report/ccsGzReport?zdmc="+params.name,
    btn: ['关闭'],
    yes: function (index, layero) {
        layer.close(index);
    }
};
$.modal.openOptions(options);