bug: canvas.addEventListener touchmove doesn't work

[ablegao]

Type: bug

Platform: ios 8 webview

I have a ion-view :

<ion-view view-title="战斗" can-swipe-back=false >
<ion-content scroll="false" >
<canvas  style="min-height:100%;width:100%;"  id="canvas" ></canvas>
</ion-content>

In my contoller .

 var canvas  = document.getElementById("canvas");
 canvas.addEventListener("touchmove",$scope.touchmove,false);
 canvas.addEventListener("touchstart",$scope.touchmove,false);
 canvas.addEventListener("touchend",$scope.touchmove,false);

 $scope.touchmove=function(){

        console.log("YES")
  }

But , this doesn't work ,