css/world/07ex.html

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>基于ex单位的天然垂直居中对齐效果实例页面</title>
  <style>
    .icon-arrow {
      display: inline-block;
      width: 20px;
      height: 1ex;
      background: url(../images/arrow.png) no-repeat center;
    }
  </style>
</head>

<body>
  <div id='divTest1'>
    zhongankeji
    <i class="icon-arrow"></i>
  </div>
  <br>
  <div id='divTest2'>
    众安科技
    <i class="icon-arrow"></i>
  </div>
  <br> 修改字体和大小
  <select id="selFontFamily">
    <option value="simsun">宋体</option>
    <option value="microsoft yahei">微软雅黑</option>
    <option value="Arial">Arial</option>
    <option value="Tamoha">Tamoha</option>
    <option value="Consolas">Consolas</option>
  </select>
  <select id="selFontSize">
    <option value="14px">14px</option>
    <option value="18px">18px</option>
    <option value="24px">24px</option>
    <option value="30px">30px</option>
  </select>
</body>
<script>

  var ff = document.getElementById('selFontFamily'),
    fs = document.getElementById('selFontSize');

  var div1 = document.getElementById('divTest1'),
    div2 = document.getElementById('divTest2');

  if (ff && fs && div1 && div2) {
    ff.onchange = function () {
      div1.style.fontFamily = this.value.replace('/', ',');
      div2.style.fontFamily = this.value.replace('/', ',');
    };
    fs.onchange = function () {
      div1.style.fontSize = this.value;
      div2.style.fontSize = this.value;
    };
  }

</script>

</html>