iscroll/src/probe/_move.js

Smooth scrolling for the web

		if ( timestamp - this.startTime > 300 ) {
			this.startTime = timestamp;
			this.startX = this.x;
			this.startY = this.y;

			if ( this.options.probeType == 1 ) {
				this._execEvent('scroll');
			}
		}

		if ( this.options.probeType > 1 ) {
			this._execEvent('scroll');
		}