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var ss = ee.FeatureCollection("users/bqt2000204051/Qinghai");
var NDVIImgColl = ee.ImageCollection('LANDSAT/LC08/C01/T1_8DAY_NDVI')
                  .filterDate('2018-11-01', '2019-04-30').select('NDVI').mean();
                  
                  
Map.addLayer(NDVIImgColl.clip(ss), {}, "NDVI")
 
var NDVIavg = NDVIImgColl.clip(ss)
 
var stats = NDVIavg.reduceRegion({
    reducer: ee.Reducer.minMax(),
    geometry : ss,
    scale : 30,
    maxPixels: 1e10
  });
 
var varmax1 = ee.Number(stats.get("NDVI_max"));
print("Max NDVI in AOI", varmax1)
 
// evaluate() 将在后台运行，而 最小/最大值的计算
stats.evaluate(function(result) {
  var min = result['NDVI_min']
  var max = result['NDVI_max']
  print('Computed min/max', min, max)
  var visParams = {min: min, max:max}
  Map.addLayer(NDVIImgColl.clip(ss), visParams, 'Min/Max Stretch');
})

var stats = NDVIavg.reduceRegion({
    reducer: ee.Reducer.minMax(),
    geometry : ss,
    scale : 30,
    maxPixels: 1e10,
bestEffort：true
  });