openlayer设置地图可拖动、禁止拖动

let pan = getPan();pan.setActive(false);//false：当前地图不可拖动。true：可拖动function getFun() {    let pan;    map.getInteractions().forEach(function(element, index, array) {        if(element instanceof ol.interaction.DragPan) {            pan = element;        }    })    return pan;}