js下的冒泡排序与选择排序

//冒泡排序   for(var i=0;i<arr1.length-1;i++){      for(var j=0;j<arr1.length-i;j++){             if(arr1[j]<arr1[j+1]){                  var t=arr1[j];                  arr1[j]=arr1[j+1];                   arr1[j+1] = t;              }       }   }    for(var n=0;n<arr1.length;n++){       document.write(arr1[n]+"<br>");    }    //选择排序    //35,88,75,46,99,22,101    for(var i =0;i<arr1.length-1;i++){        for(var j=i+1;j<arr1.length;j++){               if(arr1[i]<arr1[j]){                   var t = arr1[i];                    arr1[i]=arr1[j];                   arr1[j]=t;               }       }    }for(var n=0;n<arr1.length;n++){      document.write(arr1[n]+"<br>");   }