在深圳做生意。

<form id="loginForm">
    <input type="text" id="username" placeholder="Username">
    <input type="password" id="password" placeholder="Password">
    <button type="submit" onclick="check()">Login</button>
</form>


<script>
      function check(){
     var  username = document.getElementById('username').value;
    var password = document.getElementById('password').value;
   
       if(username==='ldy'&&password==='123456')
            alert(18711533769)
       else
          alert('wrong!!!')
    }
</script>