Question

我正在尝试使用<div>更改由某些Javascript代码创建的insertbefore()的位置，但是我不知道如何在我的代码中应用它。

我的Javascript生成随机数，并创建一个<div>，在其中插入这些数字作为其子代：

<script type="text/javascript">

  var orderedList = document.getElementById("my_list");
  var itemLength = orderedList.children.length - 1; // CALCULATE LENGTH OF THE ITEM LIST

  function getRandomInt(min, max) {
      min = Math.ceil(min);
      max = Math.floor(max);
      return Math.floor(Math.random() * (max - min + 1)) + min;
  }

  // get a default 100 into the array
  var arrayOfNumbers = [100],
      listItem = document.querySelector("list_item");

  // get itemLength random numbers
  for (let i = 0; i < itemLength; i++) {
    arrayOfNumbers.push(getRandomInt(30, 98))
  }

  // sort the array of random numbers
  arrayOfNumbers.sort(function(a, b) {
    return b - a
  })

  // now do the lopping and creating elements
  for (let i = 0; i < arrayOfNumbers.length; i++) {
    let randomIntContainer = document.createElement('div');
    randomIntContainer.textContent = arrayOfNumbers[i] + "%";
    randomIntContainer.setAttribute('class', 'number');
    for (const matchingOrder of orderedList.querySelectorAll('.matching_score')) { matchingOrder.appendChild(randomIntContainer.cloneNode(true))}
  }

</script>

问题在于，带有数字的<div>显示在我的<li>元素的末尾，如下所示：

<div>
   {% if  page_obj.object_list %}
       <ol class="row top20" id="my_list">

          {% for result in page_obj.object_list %}

          <li class="list_item">
              <div class="showcase col-sm-6 col-md-4">
               <a href="{{ result.object.get_absolute_url }}">
                      <h3>{{result.object.title}}</h3>
                      <h5>{{ result.object.destination }}</h5>
                      <img src="{{ result.object.image }}" class="img-responsive">
               </a>
               </div>

          <!--  Numbers are displayed randomly here --> 90%

          </li>

           {% endfor %}

       </ol>
</div>
    {% endif %}

但是我希望将<div>和数字显示在ID为<a>的特定<div>的{{1}}标签上方，像这样：

matching_score

我该怎么做？

Answer 1

代替做

for (let i = 0; i < arrayOfNumbers.length; i++) {
    let randomIntContainer = document.createElement('div');
    randomIntContainer.textContent = arrayOfNumbers[i] + "%";
    randomIntContainer.setAttribute('class', 'number');
    for (const matchingOrder of orderedList.querySelectorAll('.matching_score')) { matchingOrder.appendChild(randomIntContainer.cloneNode(true))}
}

您需要做

for (const [i, matchingOrder] of orderedList.querySelectorAll('.matching_score').entries()) {
    let randomIntContainer = document.createElement('div');
    randomIntContainer.textContent = arrayOfNumbers[i] + "%";
    randomIntContainer.className = 'number';
    matchingOrder.appendChild(randomIntContainer);
}

示例证明其有效：

let arrayOfNumbers = [ 2,5,6,8 ];

for (const [i, matchingOrder] of orderedList.querySelectorAll('.matching_score').entries()) {
  let randomIntContainer = document.createElement('div');
  randomIntContainer.textContent = arrayOfNumbers[i] + "%";
  randomIntContainer.className = 'number';
  matchingOrder.appendChild(randomIntContainer);
}

<ol id="orderedList">
  <li>
    <div class="matching_score"></div>
    <p>Foo</p>
  </li>
  <li>
    <div class="matching_score"></div>
    <p>Bar</p>
  </li>
  <li>
    <div class="matching_score"></div>
    <p>Baz</p>
  </li>
  <li>
    <div class="matching_score"></div>
    <p>Foobar</p>
  </li>
</ol>

如何在Javascript的特定位置插入百分比

1 个答案: