<script>
  

  var arr=[1,2,3,4,5];
  

  var ret=[];
  

  for(var i=0,j=1;j<arr.length-1;i++,j++){
  

  for(var n=j+1;n<arr.length;n++){
  

  var temp=[];
  

  temp.push(arr[i]);
  

  temp.push(arr[j]);
  

  temp.push(arr[n]);
  

  ret.push(temp);
  

  }
  

  }
  

  alert("ret:"+ret)
  

  </script>