function bubbleSort(arr){  
  var len = arr.length;  
  for (var i = 0; i < len; i++) {  
    for(var j = 0; j < len - i -1; j++){  
      if(arr[j]>arr[j+1]){ //相邻元素进行对比  
        var temp = arr[j+1];//交换元素  
        arr[j+1] = arr[j];  
        arr[j] = temp;  
      }  
    }  
  }  
  return arr;//返回数组  
}  
  
var arr=[1,45,37,5,48,15,37,26,29,2,46,4,17,50,52];//调用排序算法  
console.log(bubbleSort(arr));//控制台输出结果  

function bubbleSort2(arr){  
  var i = arr.length -1;//开始时，扫描的最后位置  
  while(i>0){  
    var position = 0;//标志性变量，表示当前排序中交换的位置  
    for(var j = 0; j < i; j ++){  
      if(arr[j]>arr[j+1]){  
        position = j;  
        var temp = arr[j+1];  
        arr[j+1] = arr[j];  
        arr[j] = temp;  
      }  
    }  
    i = position;  
  }  
  return arr;  
}  
  
var arr=[1,45,37,5,48,15,37,26,29,2,46,4,17,50,52];  
console.log(bubbleSort2(arr));  

function bubbleSort3(arr){  
  var low = 0;  
  var high = arr.length-1;  
  var temp;  
  while(low < high){//找到最大值  
    for(var j = low ; j < high ; j++){  
      if (arr[j]> arr[j+1]) {       
        temp = arr[j+1];  
        arr[j+1] = arr[j];  
        arr[j] = temp;  
       }  
    }  
    --high;//修改high值，向前移一位  
  }  
  while(low > high){//找到最小值  
    for(var j = high ;j > low; j--){  
      if (arr[j]> arr[j+1]) {       
        temp = arr[j+1];  
        arr[j+1] = arr[j];  
        arr[j] = temp;  
       }  
    }  
    ++low;//修改low值，往后移动一位  
  }  
  return arr;  
}  
var arr=[1,45,37,5,48,15,37,26,29,2,46,4,17,50,52];  
console.log(bubbleSort3(arr));