函数：size()Returnsthenumberofelementsinthecollection.返回集合中元素的数量。Arguments:this:collection(FeatureCollection):Thecollectiontocount.Returns:Integer融合影像可以一个接一个进行融合merge(collection2)Mergestwoimagecollectionsi

 函数：ui.Chart.image.doySeries(imageCollection, region, regionReducer, scale, yearReducer, startDay, endDay)