使用百度地图最新API加载geojson实现覆盖物，geojson示例

以下是一个简单的geojson示例：

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "geometry": {
        "type": "Point",
        "coordinates": [
          -122.4194167,
          37.7749295
        ]
      },
      "properties": {
        "name": "San Francisco"
      }
    },
    {
      "type": "Feature",
      "geometry": {
        "type": "LineString",
        "coordinates": [
          [-122.48369693756104, 37.83381888486939],
          [-122.48348236083984, 37.83317489144141],
          [-122.48339653015138, 37.83270036637107],
          [-122.48356819152832, 37.832056363179625],
          [-122.48404026031496, 37.83114119107971],
          [-122.48404026031496, 37.83049717427869],
          [-122.48348236083984, 37.829920943955045],
          [-122.48356819152832, 37.82954808664175],
          [-122.48507022857666, 37.82944639795659],
          [-122.48610019683838, 37.82880236636284],
          [-122.48695850372314, 37.82931081282506],
          [-122.48700141906738, 37.83080223556934],
          [-122.48751640319824, 37.83168351665737],
          [-122.48803138732912, 37.832158048267786],
          [-122.48888969421387, 37.83297152392784],
          [-122.48987674713133, 37.83263257682617],
          [-122.49043464660643, 37.832937629287755],
          [-122.49125003814696, 37.832429207817725],
          [-122.49163627624512, 37.832564787218985],
          [-122.49223709106445, 37.83337825839438],
          [-122.49378204345702, 37.83368330777276]
        ]
      },
      "properties": {
        "name": "Golden Gate Bridge"
      }
    }
  ]
}

以上示例包含了一个点和一条线段，可以通过百度地图API加载并显示在地图上。