javascript - 我对这个数组做错了什么？

Question

好吧，尝试组合一个数字数组并按升序排列。我越看越迷惑自己。警报显示为“未定义”。我在忽略什么？

var random = new Array();
function main() {
    generate();
    original();
    ascending(random);
}
function generate() {
    document.write("Here are 25 Random Numbers:<br><br>");
    for (var i = 0; i < 25; i++) {
        random[i] = document.write(Math.floor(Math.random() * 100) + ", ");
    }
}
function original() {
    var storage = "";
    for (var i = 0; i < 25; i++) {
        storage += random[i] + ", ";
    }
    alert(storage);
}
function ascending(random) {
    var tempArray = random;
    var storage = "";
    random.sort(function (a, b) {
        return a - b
    });

    for (i = 0; i < 25; i++) {
        storage += tempArray[i] + ", ";
    }
    alert("ASCENDING- " + storage);
}

Answer 1

不需要document.write(不确定你想用它实现什么)，这已经足够了:

random[i] = Math.floor(Math.random() * 100);

之后如果需要转为字符串输出，只需加入:

random.join(",");

<小时/>

这是您的生成函数:

var random = [];

function generate() {
  document.write("Here are 25 Random Numbers:<br><br>");
  for (var i = 0; i < 25; i++) {
    random[i] = Math.floor(Math.random() * 100);
  }
}

generate();
var str = random.join(', ');
document.write(str);

<小时/>

注意:尝试 avoid using document.write whenever you can .