检查设备是移动端还是pc端，然后确认使用什么事件

    var _device = /Android|webOS|iPhone|iPod|iPad|BlackBerry/i.test(navigator.userAgent);
    var clickEvent = _device ? 'touchstart' : 'mousedown';
    var moveEvent = _device ? 'touchmove' : 'mousemove';
    var upEvent = _device ? 'touchend' : 'mouseup';