js選擇排序

//選擇排序
var arNums = [65, 52, 74, 14, -1, 2, 88];
var b = 0;
for (var i = 0; i < arNums.length; i++) {
    for (var j = i+1; j < arNums.length; j++) {
        if (arNums[i] > arNums[j]) {
            a = arNums[i];
            arNums[i] = arNums[j];
            arNums[j] = a;
        }
    }
}
for (var i in arNums) {
    console.log(i)
    if (i != arNums.length - 1) {
        document.write(arNums[i] + ',');
    } else {
        document.write(arNums[i]);
    }
}