数组dome

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<script>

    var arr2 = [7,6,15,4,13,2,1];

    var aaa = sort(arr2, function (a,b) {
        return b-a;
    });

    console.log(aaa);

    function sort(arr,fn){
        for(var i=0;i<arr.length-1;i++){
            for(var j=0;j<arr.length-1;j++){
                if(fn(arr[j],arr[+j1])>0){
                    var temp = arr[j];
                    arr[j] = arr[j+1];
                    arr[j+1] = temp;
                }
            }
        }
        return arr;
    }



</script>
</body>
</html>

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