1function chunkArray(arr,n){
2     var chunkLength = Math.max(arr.length/n ,1);
3     var chunks = [];
4     for (var i = 0; i < n; i++) {
5         if(chunkLength*(i+1)<=arr.length)chunks.push(arr.slice(chunkLength*i, chunkLength*(i+1)));
6     }
7     return chunks; 
8 }