You can use them in Image.visualize before adding the result to the map.

You can use them in Image.visualize before adding the result to the map. You just plug the visualization parameters (with the computed values) into visualize, exactly like you're trying to do with Map.addLayer:

var EVIVisParam = { min: EVI_Min, max: EVI_Max, palette: ['FFFFFF', 'CE7E45', 'DF923D', 'F1B555', 'FCD163', '99B718', '74A901', '66A000', '529400', '3E8601', '207401', '056201', '004C00', '023B01', '012E01', '011D01', '011301'] } Map.addLayer(Aster_EVI2.visualize(EVIVisParam), {}, 'Aster EVI'); 

https://code.earthengine.google.com/4835e1695798d0d363c105bf99d12eaf

You can use them in Image.visualize before adding the result to the map.

You can use them in Image.visualize before adding the result to the map.