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HTML5本地存储应用sessionStorage和localStorage

时间:2021-07-01 10:21:17 帮助过:39人阅读

在html5之前,浏览器要实现数据的存储,一般都是用cookie,但是cookie有域名和大小限定.

html5流行之后,可以通过localStorage和sessionStorage实现浏览器端的数据存储,这两者有什么特点呢?

sessionStorage
  sessionStorage属于临时会话,数据存储的有效期为:从页面打开到页面关闭的时间段,属于窗口的临时存储,页面关闭,本地存储消失

localStorage

  • 永久存储(可以手动删除数据)

  • 存储量限制 ( 5M )

  • 客户端完成,不会请求服务器处理

  • sessionStorage数据在页面之间不能共享、 而localStorage可以实现页面之间共享

sessionStorage的应用:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
    <script>
        window.onload = function(){
            var aInput = document.getElementsByTagName('input');
            aInput[0].onclick = function(){
                //sessionStorage: 临时存储, 只在当前页面有效,不能传递到其他页面,页面关闭之后消失
                window.sessionStorage.setItem("name", aInput[3].value );
            };
            aInput[1].onclick = function(){
                alert(window.sessionStorage.getItem("name" ));
            };
            aInput[2].onclick = function(){
                window.sessionStorage.removeItem("name" );
            };
        }
    </script>
</head>
<body>
<input type="button" value="设置" />
<input type="button" value="获取" />
<input type="button" value="删除" />
<br/>
<input type="text" />
</body>
</html>


localStorage的应用

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
    <script>
        window.onload = function(){
            var aInput = document.getElementsByTagName('input');
            aInput[0].onclick = function(){
                //localStorage : 永久性存储
                window.localStorage.setItem("name", aInput[3].value);
                window.localStorage.setItem("name2", 'aaaaa');
            };
            aInput[1].onclick = function(){
                alert( window.localStorage.getItem( "name" ) );
                alert( window.localStorage.getItem( "name2" ) );
            };
            aInput[2].onclick = function(){
                window.localStorage.removeItem("name");
//                window.localStorage.clear();
            };
        }
    </script>
</head>
<body>
<input type="button" value="设置" />
<input type="button" value="获取" />
<input type="button" value="删除" />
<br/>
<input type="text" />
</body>
</html>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
    <script>
        window.onload = function () {
            var aInput = document.getElementsByTagName("input");
            var oT = document.querySelector("textarea");

            if (window.localStorage.getItem("userName")) {
                aInput[0].value = window.localStorage.getItem("userName");
            }

            for (var i = 0; i < aInput.length; i++) {
                if (window.localStorage.getItem('sex') == aInput[i].value) {
                    aInput[i].checked = true;
                }
            }

            if (window.localStorage.getItem("note")) {
                oT.value = window.localStorage.getItem("note");
            }

            window.onunload = function () {
                if (aInput[0].value) {
                    window.localStorage.setItem("userName", aInput[0].value);
                }

                for (var i = 0; i < aInput.length; i++) {
                    if (aInput[i].checked == true) {
                        window.localStorage.setItem('sex', aInput[i].value);
                    }
                }

                if (oT.value) {
                    window.localStorage.setItem('note', oT.value);
                }
            }
        }
    </script>
</head>
<body>
<p>
    用户名: <input type="text"/>
</p>

<p>
    性别: <br/>
    <input type="radio" name="sex" value="男"/>男
    <input type="radio" name="sex" value="女"/>女
</p>

<p>
    备注:
    <textarea cols="30" rows="10"></textarea>
</p>

</body>
</html>

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