This method restores the L global variable to the original value it had before Leaflet inclusion, and returns the real Leaflet namespace so you can put it elsewhere, like this:
此方法将L全局变量恢复为包含传单之前的原始值，并返回真正的传单命名空间，以便您可以将其放在其他位置，如下所示：
<script src='libs/l.js'>
<!-- L points to some other library -->
<script src='leaflet.js'>
<!-- you include Leaflet, it replaces the L variable to Leaflet namespace -->
<script>
var Leaflet = L.noConflict();
// now L points to that other library again, and you can use Leaflet.Map etc.
</script>