/**@private */
__proto.loop=function(){
var mouseY=Laya.stage.mouseY;
var mouseX=Laya.stage.mouseX;
this._lastOffset=this.isVertical ? (mouseY-this._lastPoint.y):(mouseX-this._lastPoint.x);
if (this._clickOnly){
//TODO vison 2019/5/9
if (Math.abs(this._lastOffset *(this.isVertical ? Laya.stage._canvasTransform.getScaleY():Laya.stage._canvasTransform.getScaleX()))> 20){
把1改成20
