在同一个javascript函数中创建多个跨度

Question

var openFile = function(event) {
  var input = event.target;
  var reader = new FileReader();
  reader.onload = function() {
    var text = reader.result;
    var output = document.getElementById('output');
    
    const lines = text.split('\n');
    lines.forEach((line) => {
      const div = output.appendChild(document.createElement('div'));
      const textSplitAroundAt = line.split('Microsoft');
      textSplitAroundAt.forEach((text, i) => {
        div.appendChild(document.createTextNode(text));
        if (i === textSplitAroundAt.length - 1) return;
        const span = div.appendChild(document.createElement('span'));
        span.textContent = 'Microsoft';
        span.className = 'colorMicrosoft';
      });

    });
    document.getElementById('populateAt').textContent = text.split('@').length - 1;
    document.getElementById('populateMicrosoft').textContent = text.split('Microsoft').length - 1;
    document.getElementById('populateGoogle').textContent = text.split('Google').length - 1;
  };
  reader.readAsText(input.files[0]);
};

.colorMicrosoft
{
	color: blue;
	background-color: red;
}

.colorGoogle
{
	color: red;
	background-color: blue;
}

.colorAt
{
	color: blue;
	background-color: green;
}

<center>
  <h1>.TXT Log Parser</h1>
</center>

<center>
  <div>I would like the number of times '@' symbol appears here: <span id="populateAt"> ... </span></div>
  <div>I would like the number of times 'Microsoft' symbol appears here: <span id="populateMicrosoft"> ... </span></div>
  <div>I would like the number of times 'Google' symbol appears here: <span id="populateGoogle"> ... </span></div>   
</center>	

<center>
  <h2><input type='file' accept='text/plain' onchange='openFile(event)'></h2>
</center>
<br/>
<div id='output'>...</div>

只要看看下面的代码片段，我正在将文本文件加载到div中。     目前，我可以计算出特定字符串出现的次数。     另外，我可以通过span更改每个“Microsoft”字符串的颜色。     但是，我似乎无法为“Google”和“@”添加多个跨度     我应该使用数组吗？若然，怎么做？