Use localStorage in HTML5 to implement the password remembering function-H5 Tutorial-php.cn

Use localStorage in HTML5 to implement the password remembering function

巴扎黑

Release： 2017-09-09 11:51:17

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This article mainly introduces the implementation of HTML5's super simple localStorage function of remembering passwords. It is of great practical value. Friends in need can refer to it

HTML5 provides two ways to store data on the client. New method:

localStorage - data storage without time limit
sessionStorage - data storage for a session

Before, these were all done by cookies. But cookies are not suitable for storing large amounts of data because they are passed with each request to the server, which makes cookies slow and inefficient.

In HTML5, data is not passed by every server request, but data is only used when requested. It makes it possible to store large amounts of data without affecting website performance.

For different websites, data is stored in different areas, and a website can only access its own data.

HTML5 uses JavaScript to store and access data.

The data stored by the localStorage method has no time limit. The data is still available after the next day, week or year.

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta charset="utf-8">
    <script src="http://libs.baidu.com/jquery/1.9.1/jquery.min.js"></script>
</head>
<style type="text/css">
    form{
        width: 300px;
        padding: 10px 0px 20px 30px;
        height:auto;
        border-radius: 6px;
        border-left:8px solid #19a049;
        background:#eee;
        margin:100px auto;
    }
    #user,#pass{
        padding: 8px;
        outline: none;
        background: transparent;
        border:1px solid #999;
        margin-top: 5px;
    }
    #sub{
        padding: 6px;
        outline: none;
        border:none;
        background: #19a049;
        color:#fff;
        width: 150px;
        border-radius: 6px;
        cursor: pointer;
    }
</style>
<body>
    <form action="" method="" onsubmit="return loginBtn_click();">
        <h3>Log in</h3>
        <input type="text" name="user" placeholder="user" id="user">
        <input type="password" name="pass" placeholder="password" id="pass">
        <input type="checkbox" id="remember" checked><br/><br/>
        <input type="submit" id="sub">
    </form>
</body>
<script type="text/javascript">
    $(document).ready(function(){

        var strName = localStorage.getItem(&#39;keyName&#39;);
        var strPass = localStorage.getItem(&#39;keyPass&#39;);
        if(strName){
            $(&#39;#user&#39;).val(strName);
        }if(strPass){
            $(&#39;#pass&#39;).val(strPass);
        }

    });

    function loginBtn_click(){
            var strName = $(&#39;#user&#39;).val();
            var strPass = $(&#39;#pass&#39;).val();
            localStorage.setItem(&#39;keyName&#39;,strName);
            if($(&#39;#remember&#39;).is(&#39;:checked&#39;)){
                localStorage.setItem(&#39;keyPass&#39;,strPass);
            }else{
                localStorage.removeItem(&#39;keyPass&#39;);
            }
        }
</script>
</html>

Copy after login

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