Using localStorage in JS to Prevent Data Loss after Page Dynamic Adding Data Refresh

2021-08-03 08:43:34
OfStack

Very little to say, I posted the code directly to everyone. The specific code is as follows:


<!doctype html>
<html lang="en">
<head>
 <meta charset="UTF-8" />
 <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
 <title>Document</title>
 <script src="https://cdn.bootcss.com/jquery/3.1.1/jquery.min.js"></script>
</head>
<body>
 <ul>
  <li>555</li>
  <li>555</li>
  <li>555</li>
  <li>555</li>
 </ul>
 <button>button</button>
 <script type="text/javascript">
  var arrary_li = document.querySelectorAll("li");
  var num;
  $('button').on('click', function () {
    $('li').last().addClass('active')
    for (var i = 0; i < arrary_li.length; i++) {
     if (arrary_li[i].className === 'active') {
      num = i;
     }
    }
    localStorage.setItem('num', num)
    location.reload()
  })
  var getNum = parseInt(localStorage.getItem('num'));
  $('li').eq(getNum).addClass('active');
 </script>
</body>
</html>