Change (and change back) leaflet icon on click - onclick

Question

I've gotten the icon to change on click, but I need it to change back to the original icon (not stay the new one) when a new icon is clicked.
For instance, say all of my icons are blue. When I click on an icon, I want it to change to a red icon. Then, when I click on a new icon, I want the previously clicked icon to change back to blue.
I can get it to work with mouseover and mouseout, but I really need it to work with click. I think I need to log a new click function, but I'm not sure how.
Here's what I currently have:
function clickFeature(e) {
var layer = e.target;
e.target.setIcon(stop);
info.update(layer.feature.properties);
}
var geojson;
/*function resetHighlight(e) {
geojson.resetStyle(e.target);
e.target.setIcon(arms);
info.update();
}*/
function onEachFeature(feature, layer) {
layer.on({
click: clickFeature
});
}
geojson = L.geoJson(crossingData, {
pointToLayer: function (feature, latlng) {
return L.marker(latlng, {icon: arms});
},
onEachFeature: onEachFeature
}).addTo(map);

Answer 1

You can try to define seprate variable outside of function, that will hold currently clicked marker.
var clickedMarker;
function clickFeature(e) {
if(clickedMarker) {
clickedMarker.setIcon(arms);
}
var layer = e.target;
e.target.setIcon(stop);
clickedMarker = e.target;
info.update(layer.feature.properties);
}

Answer 2

You should get current icon for change to another one. Unfortunately L.marker has no getIcon() method, but you can access it via options.icon.
function clickFeature(e) {
var layer = e.target;
layer.setIcon(layer.options.icon == arms ? stop : arms);
}