lib/require.js
function(callback) {
			var original = Loader.using;
			Loader.using = this;
			try{
				callback();
			}finally{
				Loader.using = original;
			}
		}
function(callback) {
			var original = Loader.using;
			Loader.using = this;
			try{
				callback();
			}finally{
				Loader.using = original;
			}
		}
function ( callback ) { var original = Loader . using ; Loader . using = this ; try { callback ( ) ; } finally { Loader . using = original ; } }
Use this `Loader` for the duration of the callback specified.
Use this Loader for the duration of the callback specified .