HTML5注册表单设计与验证教程

  用户名：
  

  邮箱：
  

  密码：
  

  确认密码：
  

  手机号：
  

  注册

document.getElementById('registerForm').addEventListener('submit', function(e) {
  const password = document.getElementById('password').value;
  const confirmPassword = document.getElementById('confirmPassword').value;

  if (password !== confirmPassword) {
    alert('两次输入的密码不一致！');
    e.preventDefault(); // 阻止表单提交
  }
});

document.getElementById('confirmPassword').addEventListener('input', function() {
  const password = document.getElementById('password').value;
  const confirmPassword = this.value;
  if (confirmPassword && password !== confirmPassword) {
    this.setCustomValidity('密码不匹配');
  } else {
    this.setCustomValidity('');
  }
});

input:valid {
  border-color: green;
  outline: 1px solid #aef;
}

input:invalid {
  border-color: red;
  outline: 1px solid #fda;
}

input:focus:invalid {
  box-shadow: 0 0 5px rgba(255,0,0,0.3);
}