One common interview questions javascript: bubble sort array;

   
 var ARR = [ 32 , 2 , . 7 , 78 , 90 , 10 ]; 
  // number of outer loop control wheel;
     for ( var I = 0 ; I <arr.length; I ++ ) { 
     // number of times the inner loop control;
       for ( var J = 0 ; J <arr.length- . 1 -i; J ++ ) { 
　　　　　　　// if comparing two numbers is determined;
            if (ARR [J]> ARR [J + . 1 ]) { 
　　　　　　　// through a third party variable position switching element
             var tmp = ARR [J]; 
            ARR [J] = ARR [J + . 1];
            arr[j+1]=tmp;
           }
      }
    }
    console.log(arr);