Solar-System:单页应用

太阳系 要求 将下面的代码复制到JavaScript文件中，然后按照注释中的说明进行操作。 var planets = [ "mercury" , "venus" , "earth" , "mars" , "jupiter" , "saturn" , "uranus" , "neptune" ] ; /* Use the forEach method to add the name of each planet to a div element in your HTML with an id of "planets". */ var el = document . getElementById ( "planets" ) ; // Use the map method to create a new array where the first letter of each planet