function arrange(source) {

            var t;

            var ta;

            var r = [];

            for(var j=0;j<source.length;j++){

                var v=source[j];

                if(v!=null){

                    //console.log(t, v);   // 跟踪调试用

                    if (t === v) {

                        ta.push(t);

                        t++;

                        continue;

                    }

                    ta = [v];

                    t = v + 1;

                    r.push(ta);

                }

            }

            return r;

        }

    var arr = [3, 4, 13, 14, 15, 17, 20, 22];

      console.log(arrange(arr));
//结果 [[3,4],[13,14,15],[17],[20],[22]]