在手势期间不发生火警

Question

我试图在手势期间触发这些警报，而不是在手势结束后。因此，在缩放手势期间，当刻度为0.5或更小时，或者当刻度大于1.0时。

Hammer.js：http://eightmedia.github.io/hammer.js/

到目前为止，这是我的代码：

var hammertime = Hammer(document.body, {
       transform_always_block: true,
       transform_min_scale: 0,
       drag_block_horizontal: true,
       drag_block_vertical: true,
       drag_min_distance: 0
});

var posX = 0,
    posY = 0,
    lastPosX = 0,
    lastPosY = 0,
    bufferX = 0,
    bufferY = 0,
    scale = 1,
    last_scale,
    rotation = 1,
    last_rotation,
    dragReady = 0;

hammertime.on('touch drag dragend transform transformend', function(ev) {

    if ((" " + ev.target.className + " ").indexOf(" dataCard ") < 0) return;
    else manageMultitouch(ev, ev.target);

});

function manageMultitouch(ev, element) {

     switch (ev.type) { 
        case 'touch': last_scale = scale;
                last_rotation = rotation;
                return;
        case 'dragend':
                lastPosX = posX; 
                lastPosY = posY; 
                return; 
        case 'drag':
               posX = ev.gesture.deltaX + lastPosX;
               posY = ev.gesture.deltaY + lastPosY; 
               break; 
        case 'transform':
               rotation = last_rotation + ev.gesture.rotation;
               scale = Math.min(last_scale * ev.gesture.scale, 10);
               break;
     }

     if(scale <= 0.5) alert("scale is less than or equal to 0.5");

     if(scale > 1.0 ) alert("scale is bigger than 1.0");

     var transform = "translate(" + 0 + "px," + 0 + "px) " + "scale(" + 0 + "," + scale + ")"; 
     var style = element.style;
     style.transform = transform;
     style.oTransform = transform;
     style.msTransform = transform;
     style.mozTransform = transform;
     style.webkitTransform = transform;
  }