<div id="myTab0_Content1" class="none">
                  <input type="button" id="startBtn"onclick="startTool()" value="开启取点工具"/>
                  <input type="button" onclick="map.clearOverlays();document.getElementById('info').innerHTML = '';points=[];" value="清除地图取点"/>
                  <div id="info"></div>
              </div>