javascript - 数组和对象作为数据库

Question

我正在制作一个登录系统!为了存储数据，我放置了一个包含对象的数组，就像一个数据库。当我检查数据库中是否存在用户名和密码时，一切正常，但是如果我再做一次检查，例如用户名和密码字段是否已填写，那么它就无法正常工作。当我将此检查添加到 any 然后，当我输入现有的用户名和密码时，我会收到“错误的用户名或密码”消息。

<input type="text" id='username'>
<input type="password" id='password'>
<input type="submit" id="submitlogin" value="Login" onclick="login()">

var database = [
        {
            username: "amr",
            password: "123",
        },
        {
            username: "asmr",
            password: "321",
        },
        {
            username: "amrik",
            password: "1234",
        }
]
function login (){
var user = document.getElementById('username').value;
var pass = document.getElementById('password').value;
for(var i = 0; i < database.length; i++)
{     if(user === "" && pass === "")
      {
         alert("enter username and password");
         return;
      }
      if(user === database[i].username && pass === database[i].password) {
        window.location.href = "index.html";
      } 
}
    alert("error username or password");
    return;
}

Answer 1

也许使用变量来检查登录状态？

function login (){
var user = document.getElementById('username').value;
var pass = document.getElementById('password').value;
var loggedIn = 0;

for(var i = 0; i < database.length; i++)
{     if(user === "" && pass === "")
      {
         alert("enter username and password");
         return;
      }
      if(user === database[i].username && pass === database[i].password) {
        loggedIn = 1;
        window.location.href = "index.html";
      } 
}

if(loggedIn == 0)
{
    alert("error username or password");
}

    return;
}

https://jsfiddle.net/40wonL6y/