冒泡排序

 

function maopao(){
var arr = [5,4,6,7,3,9,1,8,2];
for(var i = 0 ; i < arr.length ; i++){
for(var k = 0 ; k < arr.length ; k++){
if(arr[k] > arr[k+1]){
var a = arr[k];
arr[k] = arr[k+1];
arr[k+1] = a;
}
}
}
console.log(arr);
}