index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="printArea">
  我是打印内容
  <label>
    <input type="radio" value="1" name="name">
    选项1
  </label>
  <label>
    <input type="radio" value="2" name="name">
    选项2
  </label>

  <label>
    <input type="checkbox" value="1" name="name">
    选项4
  </label>
  <label>
    <input type="checkbox" value="2" name="name">
    选项5
  </label>
<br/>
  <select>
    <option value="1">name1</option>
    <option value="2">name2</option>
    <option value="3">name3</option>
  </select>

  <br/>

  <textarea></textarea>
</div>
<button id="print" onclick="f()">打印</button>
<script src="./dist/index.js"></script>
<script>
  function f() {
    var pa = new PrintArea('#printArea');
    pa.print();
  }
</script>
</body>
</html>