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							- function getRandomCoords(bound) {
 -     let minX = bound.min.x;
 -     let minY = bound.min.y;
 -     let maxX = bound.max.x;
 -     let maxY = bound.max.y;
 -     var _x = Math.floor(Math.random() * (maxX - minX)) + minX;
 -     var _y = Math.floor(Math.random() * (maxY - minY)) + minY;
 -     return { x: _x, y: _y }
 - }
 - 
 - var _markers = []
 - 
 - function _randomDomMarker(map, num) {
 -     for (let index = 0; index < num; index++) {
 -         var domMarker = new fengmap.FMDomMarker({
 -             x: getRandomCoords(map.getBound()).x,
 -             y: getRandomCoords(map.getBound()).y,
 -             content: '<p class="my-popup">' + getRandomCoords(map.getBound()).x + '</p>',
 -             domWidth: 10,
 -             domHeight: 10
 -         });
 -         var level = map.getLevel()
 -         var floor = map.getFloor(level);
 -         domMarker.addTo(floor);
 -         _markers.push(domMarker)
 -     }
 - }
 - 
 - function _clearAllDomMarker() {
 -     _markers.forEach(marker => {
 -         marker.remove();
 -     });
 - }
 
 
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