​x
 
<!DOCTYPE html>
<html>
<body>
​
<p>带有必须包含 6 个或更多字符的密码字段的表单：</p>
​
<form action="/demo/htmldom/action_page.php">
  密码：<input type="password" id="myPsw" name="pw" pattern=".{6,}" title="六个或更多字符">
  <input type="submit">
</form>
​
<p>点击“试一试”按钮，显示 email 字段的 pattern 属性的值。</p>
​
<button onclick="myFunction()">试一试</button>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var x = document.getElementById("myPsw").pattern;
  document.getElementById("demo").innerHTML = x;
}
</script>
​
</body>
</html>
​