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我有一张通过 Google Maps API v3 实现的地图。我只想添加一个覆盖整个地图的图像，被拉伸到地图容器的 100% 宽度和高度，并出现在标记和控件的后面。我已经搜索了很长时间，但我找不到解决方案。我怎样才能做到这一点？