小程序手势缩放图片

movable-view 的高度必须大于该组件内所有图片的高度，图片放大时才可以看到全部图片

<view>
  <movable-area style="width: 100%; background: red;" scale-area>
    <movable-view style="height:800px;width: 100%; background: blue;" direction="all" scale scale-min="1" >
      <image style='width:100%' src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1550481573116&di=6325896360c950798a15ef8e4abe57b6&imgtype=0&src=http%3A%2F%2Fnews.mydrivers.com%2FImg%2F20120326%2F2012032610175591.jpg"></image>

       <image style='width:100%' src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1550481573116&di=6325896360c950798a15ef8e4abe57b6&imgtype=0&src=http%3A%2F%2Fnews.mydrivers.com%2FImg%2F20120326%2F2012032610175591.jpg"></image>

        <image style='width:100%' src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1550481573116&di=6325896360c950798a15ef8e4abe57b6&imgtype=0&src=http%3A%2F%2Fnews.mydrivers.com%2FImg%2F20120326%2F2012032610175591.jpg"></image>
    </movable-view>
  </movable-area>
  </view>