W3School TIY Editor

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
/* 设置所有输入字段的样式 */
input {
  width: 100%;
  padding: 12px;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
  margin-top: 6px;
  margin-bottom: 16px;
}

/* 设置提交按钮的样式 */
input[type=submit] {
  background-color: #04AA6D;
  color: white;
}

/* 设置输入容器的样式 */
.container {
  background-color: #f1f1f1;
  padding: 20px;
}

/* 当用户单击密码字段时显示消息框 */
#message {
  display:none;
  background: #f1f1f1;
  color: #000;
  position: relative;
  padding: 20px;
  margin-top: 10px;
}

#message p {
  padding: 10px 35px;
  font-size: 18px;
}

/* 当要求正确时，添加绿色文本颜色和勾选标记 */
.valid {
  color: green;
}

.valid:before {
  position: relative;
  left: -35px;
  content: "✔";
}

/* 当要求错误时，添加红色文本颜色和一个 "x" 图标。 */
.invalid {
  color: red;
}

.invalid:before {
  position: relative;
  left: -35px;
  content: "✖";
}
</style>
</head>
<body>

<h1>密码验证</h1>
<p>请尝试提交表单。</p>

<div class="container">
  <form action="/action_page.php">
    <label for="usrname">Username</label>
    <input type="text" id="usrname" name="usrname" required>

<label for="psw">Password</label>
    <input type="password" id="psw" name="psw" pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}" title="必须包含至少一个数字、一个大写字母和一个小写字母，且长度至少为 8 个字符或以上。" required>
    
    <input type="submit" value="Submit">
  </form>
</div>

<div id="message">
<h3>密码必须包含：</h3>
<p id="letter" class="invalid">一个<b>小写</b>字母</p>
<p id="capital" class="invalid">一个<b>大写</b>字母</p>
<p id="number" class="invalid">一个<b>数字</b></p>
<p id="length" class="invalid">至少 <b>8 个字符</b></p>
</div>
				
<script>
var myInput = document.getElementById("psw");
var letter = document.getElementById("letter");
var capital = document.getElementById("capital");
var number = document.getElementById("number");
var length = document.getElementById("length");

// 当用户单击密码字段时，显示消息框
myInput.onfocus = function() {
  document.getElementById("message").style.display = "block";
}

// 当用户单击密码字段之外时，隐藏消息框
myInput.onblur = function() {
  document.getElementById("message").style.display = "none";
}

// 当用户开始在密码字段中输入内容时
myInput.onkeyup = function() {
  // Validate lowercase letters
  var lowerCaseLetters = /[a-z]/g;
  if(myInput.value.match(lowerCaseLetters)) {
    letter.classList.remove("invalid");
    letter.classList.add("valid");
  } else {
    letter.classList.remove("valid");
    letter.classList.add("invalid");
}

// 验证大写字母
  var upperCaseLetters = /[A-Z]/g;
  if(myInput.value.match(upperCaseLetters)) {
    capital.classList.remove("invalid");
    capital.classList.add("valid");
  } else {
    capital.classList.remove("valid");
    capital.classList.add("invalid");
  }

// 验证数字
  var numbers = /[0-9]/g;
  if(myInput.value.match(numbers)) {
    number.classList.remove("invalid");
    number.classList.add("valid");
  } else {
    number.classList.remove("valid");
    number.classList.add("invalid");
  }

// 验证长度
  if(myInput.value.length >= 8) {
    length.classList.remove("invalid");
    length.classList.add("valid");
  } else {
    length.classList.remove("valid");
    length.classList.add("invalid");
  }
}
</script>

</body>
</html>