dev/build/tasks/build.lazyload.js
function getExtension(file) {
        var ret;
        if (file) {
            var fileTypes = file.split('.');
            var len = fileTypes.length;
            if (0 === len) {
                return ret;
            }
            ret = fileTypes[len - 1];
            return ret;
        }
    }
function getExtension(file) {
        var ret;
        if (file) {
            var fileTypes = file.split('.');
            var len = fileTypes.length;
            if (0 === len) {
                return ret;
            }
            ret = fileTypes[len - 1];
            return ret;
        }
    }
function getExtension ( file ) { var ret ; if ( file ) { var fileTypes = file . split ( '.' ) ; var len = fileTypes . length ; if ( 0 === len ) { return ret ; } ret = fileTypes [ len - 1 ] ; return ret ; } }
! get file extension.
! get file extension .