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web 存储

时间:2020-03-08 13:55:27      阅读:77      评论:0      收藏:0      [点我收藏+]

标签:def   浏览器   for   class   value   get   url   str   storage   

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
        <div style="border: 2px dashed #ccc;width:320px;text-align:center;">     
                <label for="sitename">网站名(key):</label>  
                <input type="text" id="sitename" name="sitename" class="text"/>  
                <br/>  
                <label for="siteurl">网 址(value):</label>  
                <input type="text" id="siteurl" name="siteurl"/>  
                <br/>  
                <input type="button" onclick="save()" value="新增记录"/>  
                <hr/>  
                <label for="search_phone">输入网站名:</label>  
                <input type="text" id="search_site" name="search_site"/>  
                <input type="button" onclick="find()" value="查找网站"/>  
                <p id="find_result"><br/></p>  
            </div>  
            <br/>  
            <div id="list">  
            </div>  
            <script>
            // 载入所有存储在localStorage的数据
            loadAll();     
                
            //保存数据  
            function save(){  
                var siteurl = document.getElementById("siteurl").value;  
                var sitename = document.getElementById("sitename").value;  
                localStorage.setItem(sitename, siteurl);
                alert("添加成功");
            }
            //查找数据  
            function find(){  
                var search_site = document.getElementById("search_site").value;  
                var siteurl = localStorage.getItem(search_site);  
                var find_result = document.getElementById("find_result");  
                find_result.innerHTML = search_site + "的网址是:" + siteurl;  
            }
            //将所有存储在localStorage中的对象提取出来,并展现到界面上
            function loadAll(){  
                var list = document.getElementById("list");  
                if(localStorage.length>0){  
                    var result = "<table border=‘1‘>";  
                    result += "<tr><td>key</td><td>value</td></tr>";  
                    for(var i=0;i<localStorage.length;i++){  
                        var sitename = localStorage.key(i);  
                        var siteurl = localStorage.getItem(sitename);  
                        result += "<tr><td>"+sitename+"</td><td>"+siteurl+"</td></tr>";  
                    }  
                   // result += "</table>";  
                    list.innerHTML = result;  
                }else{  
                    list.innerHTML = "数据为空……";  
                }  
            }      
            </script>
</body>
</html>

Json处理
<!DOCTYPE html>
<html>  
<head>  
    <meta charset="utf-8">  
    <title>HTML5本地存储之Web Storage篇</title>  
</head>  
<body>  
    <div style="border: 2px dashed #ccc;width:320px;text-align:center;">
        <label for="keyname">别名(key):</label>  
        <input type="text" id="keyname" name="keyname" class="text"/>  
        <br/>  
        <label for="sitename">网站名:</label>  
        <input type="text" id="sitename" name="sitename" class="text"/>  
        <br/>  
        <label for="siteurl">网 址:</label>  
        <input type="text" id="siteurl" name="siteurl"/>  
        <br/>  
        <input type="button" onclick="save()" value="新增记录"/>  
        <hr/>  
        <label for="search_phone">输入别名(key):</label>  
        <input type="text" id="search_site" name="search_site"/>  
        <input type="button" onclick="find()" value="查找网站"/>  
        <p id="find_result"><br/></p>  
    </div>  
    <br/>  
    <div id="list">  
    </div>  
    <script>
    //保存数据  
    function save(){  
        var site = new Object;
        site.keyname = document.getElementById("keyname").value;
        site.sitename = document.getElementById("sitename").value;  
        site.siteurl = document.getElementById("siteurl").value;
        var str = JSON.stringify(site); // 将对象转换为字符串
        localStorage.setItem(site.keyname,str);  
        alert("保存成功");
    }  
    //查找数据  
    function find(){  
        var search_site = document.getElementById("search_site").value;  
        var str = localStorage.getItem(search_site);  
        var find_result = document.getElementById("find_result");
        var site = JSON.parse(str);  
        find_result.innerHTML = search_site + "的网站名是:" + site.sitename + ",网址是:" + site.siteurl;  
    }  
    
    //将所有存储在localStorage中的对象提取出来,并展现到界面上
    // 确保存储的 keyname 对应的值为转换对象,否则JSON.parse会报错
    function loadAll(){  
        var list = document.getElementById("list");  
        if(localStorage.length>0){  
            var result = "<table border=‘1‘>";  
            result += "<tr><td>别名</td><td>网站名</td><td>网址</td></tr>";  
            for(var i=0;i<localStorage.length;i++){ 
                var keyname = localStorage.key(i);  
                var str = localStorage.getItem(keyname);  
                var site = JSON.parse(str);  
                result += "<tr><td>"+site.keyname+"</td><td>"+site.sitename+"</td><td>"+site.siteurl+"</td></tr>";  
            }  
            result += "</table>";  
            list.innerHTML = result;  
        }else{  
            list.innerHTML = "数据为空...";  
        }  
    }  
    </script>
</body>  
</html>
<!-- sessionStorage 对象
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script>
            function clickCounter()
            {
                if(typeof(Storage)!=="undefined")
                {
                    if (localStorage.clickcount)
                    {
                        localStorage.clickcount=Number(localStorage.clickcount)+1;
                    }
                    else
                    {
                        localStorage.clickcount=1;
                    }
                    document.getElementById("result").innerHTML=" 你已经点击了按钮 " + localStorage.clickcount + " 次 ";
                }
                else
                {
                    document.getElementById("result").innerHTML="对不起,您的浏览器不支持 web 存储。";
                }
            }
            </script>
</head>
<body>
        <p><button onclick="clickCounter()" type="button">点我!</button></p>
        <div id="result"></div>
        <p>点击该按钮查看计数器的增加。</p>
        <p>关闭浏览器选项卡(或窗口),重新打开此页面,计数器将继续计数(不是重置)。</p>
 <div id="result"></div>
<script>
if(typeof(Storage)!=="undefined")
{
  localStorage.sitename="菜鸟教程";
  document.getElementById("result").innerHTML="网站名:" + localStorage.sitename;
}
else
{
  document.getElementById("result").innerHTML="对不起,您的浏览器不支持 web 存储。";
}
</script>      localStorage.sitename  
</body>
</html>


    localStorage - 用于长久保存整个网站的数据,保存的数据没有过期时间,直到手动去除。
    sessionStorage - 用于临时保存同一窗口(或标签页)的数据,在关闭窗口或标签页之后将会删除这些数据

保存数据:localStorage.setItem(key,value);
读取数据:localStorage.getItem(key);
删除单个数据:localStorage.removeItem(key);
删除所有数据:localStorage.clear();
得到某个索引的key:localStorage.key(index);
localStorage.removeItem("sitename");移除sitename
 -->

 

web 存储

标签:def   浏览器   for   class   value   get   url   str   storage   

原文地址:https://www.cnblogs.com/wxy0715/p/12442117.html

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