HTML 表单非空验证 - 简单易懂的实现方法

<script>
  function validateForm() {
    var name = document.forms[0]['name'].value;
    var email = document.forms[0]['email'].value;
    var password = document.forms[0]['password'].value;

    if (name == '') {
      alert('姓名不能为空');
      return false;
    }
    if (email == '') {
      alert('邮箱不能为空');
      return false;
    }
    if (password == '') {
      alert('密码不能为空');
      return false;
    }
    return true;
  }
</script>