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HTML
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>原生多选 select 组件 - Select</title>
  <link rel="stylesheet" href="../assets/mdui-v0.4.3/css/mdui.min.css"/>
</head>
<body>
<div class="mdui-container">
  <select multiple size="8" class="mdui-select">
    <optgroup label="Fonts">
      <option>Roboto</option>
      <option>Calibri</option>
      <option>Courier New</option>
      <option>Verdana</option>
    </optgroup>
    <optgroup label="Size">
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