在Javascript中使用for循环创建列表的问题

Question

我正在尝试创建一个代码来计算我拥有的图像数量，然后创建一个包含图像数量的列表（例如，如果我有 5 张图像，我会得到这个： [0,1,2,3,4]。

我的代码运行，我认为它创建了一个空列表：

这是我的代码（我试图只放相关部分）：

//First I filter my image collection according to the number of pixels each image has
//Filter according to number of pixels

var ndviWithCount = withNDVI.map(function(image){
  var countpixels = ee.Number(image.reduceRegion({
  reducer: ee.Reducer.count(),
  geometry: geometry,
  crs: 'EPSG:4326',
  scale: 30,
  }).get('NDVI'));

  return image.set('count', countpixels);
});

print(ndviWithCount, 'ndviWithCount');

//Here I count what is the maximum number of pixels that image has and then I create new collection with //only "big images"

var max = ndviWithCount.reduceColumns(ee.Reducer.max(),  ["count"]);
print(max.get('max'));
var max_pix=max.get('max');

//filter between a range
var filter = ndviWithCount.filter(ee.Filter.rangeContains(
          'count', max_pix, max_pix));
print(filter, 'filtered');
//Here I try to grab the number of images so I can create a list
var num_images=filter.size();

//creating the list of images

var listOfImages =(filter.toList(filter.size()));

//Here is the loop that diesn't work
//I have tried to determine i=0, and then that it will iterate untill i is equal to the number of images
//I try to say, i=0, so add 1 and the nadd it to my list.
for (i = 0; i < num_images; i++) {
  var listOfNumbers=[];
  i=i.add(1);
  listOfNumbers.push(i);

}

我的最终目标是列出包含从 0 或 1 到我拥有的图像数量的 nmbers。

Answer 1

我找到了解决方案。错误的原因是因为 GEE 环境。 此代码有效：

var serverList = ee.List.sequence(0,NumberOfImages.subtract(1));
serverList = serverList.map(function(n) {
  return ee.Number(n).add(1);
});
print(serverList);

Answer 2

for (i = 0; i < num_images; i++) {
  var listOfNumbers=[];
  i=i.add(1);
  listOfNumbers.push(i);
}

您在 for 循环中初始化数组，这不是您想要的。我也不确定 i = i.add(1) 应该是什么。查看for loops上的信息可能会有所帮助。

let listOfNumbers = [];
for (let i = 0; i < num_images; i++) {
      listOfNumbers.push(i);
}