Javascript Array bubble()

'use strict';/*from   w  w w  . j  a  va 2  s  .  co m*/
Array.prototype.bubble = function (){
  var i = this.length,
    tem,
    j;

  while (i>0){
    for (j=0; j < i -1; j++ ){
      if (this[j] > this[j+1]){
        tem = this[j];
        this[j] = this[j+1];
        this[j+1] = tem;
      }
    }
    i--;
  }
  console.log(this);
}
var array = [5,4,3,8,2];
array.bubble();