src/javascript/runtime/html5/file/FileDrop.js
function getEntries(cbcb) {
				dirReader.readEntries(function(moreEntries) {
					if (moreEntries.length) {
						[].push.apply(entries, moreEntries);
						getEntries(cbcb);
					} else {
						cbcb();
					}
				}, cbcb);
			}
function getEntries(cbcb) {
				dirReader.readEntries(function(moreEntries) {
					if (moreEntries.length) {
						[].push.apply(entries, moreEntries);
						getEntries(cbcb);
					} else {
						cbcb();
					}
				}, cbcb);
			}
keep quering recursively till no more entries