javascript - 将 JS 数组附加到变量并显示它？

Question

我正在尝试制作一个奇怪的在线程序，但遇到了麻烦。

这是我的代码:

        function name() {
        var titles = ["titles", "titles", "titles", "titles", "titles", "titles"];
        var randFor = Math.random();
        randFor = 7 * randFor;
        randFor = Math.floor(randFor);

        var finished = [];
        var arraySpot = 0;
        var newVal;
        var newValSpot = 0;
        newVal = finished[newValSpot];
        for (i = 0; i < randFor; i++) { 
            var randArray = Math.random();
            randArray = 7 * randArray;
            randArray = Math.floor(randArray);

            finished.push[arraySpot] = titles[randArray];

            arraySpot++;
            newValSpot++;
            newVal = " " + finished[newValSpot];
        }

        document.getElementById("gen").innerHTML =newVal;

    }

基本上，我想做的是获取一个单词数组，并将其转换为变量并将其显示在此标记中:

<div id="gen"></div>

但是每次它都会给我“未定义”，前面有一个空格？

感谢您的帮助，抱歉我在 JS 方面是个菜鸟。

更新 我修改了代码，我不再得到“未定义”，但现在我什么也没得到？

        function name() {
        var titles = ["titles", "titles", "titles", "titles", "titles", "titles"];
        var randFor = Math.random();
        randFor = 7 * randFor;
        randFor = Math.floor(randFor);

        var newVal;
        newVal = title[0];
        for (i = 0; i < randFor; i++) { 
            var randArray = Math.random();
            randArray = 7 * randArray;
            randArray = Math.floor(randArray);

            newVal = " " + titles[randArray];
        }

        document.getElementById("gen").innerHTML = newVal;

    }

Answer 1

希望这有用

• newVal = finished[newValSpot];这时，finished仍然是空数组，所以你得到了 undefined值。
• finished.push[arraySpot] = titles[randArray];请查看this对于推送方法。
• newVal = " " + titles[randArray];这将分配 newVal一个新的值，我猜你想这样做。 newVal = " " + titles[randArray];

更新

• var titles = ["titles", "titles", "titles", "titles", "titles", "titles"]; titles长度是 6，而不是 7，您应该在 titles 中再添加一个“标题” .
• newVal = " " + titles[randArray];同样的问题，我想你想这样做。 newVal = newVal + " " + titles[randArray];

function name() {
  // Add one more "titles" in this array.
  var titles = ["titles", "titles", "titles", "titles", "titles", "titles", "titles"];
  var randFor = Math.random();
  randFor = 7 * randFor;
  randFor = Math.floor(randFor);

  var newVal;
  newVal = titles[0];
  for (i = 0; i < randFor; i++) {
    var randArray = Math.random();
    randArray = 7 * randArray;
    randArray = Math.floor(randArray);

    newVal = newVal + " " + titles[randArray];
  }

  document.getElementById("gen").innerHTML = newVal;

}

name();

<div id="gen"></div>