Javascript 如何跨设备扩展本地存储（无数据库）
目标：在我的应用程序中扩展我已经实现的Javascript 如何跨设备扩展本地存储（无数据库）,javascript,node.js,json,cookies,local-storage,Javascript,Node.js,Json,Cookies,Local Storage,目标：在我的应用程序中扩展我已经实现的localStorage，好吧，我想是非本地的 我喜欢使用本地存储API保存简单用户设置的实现。我在一个web应用程序中使用它来满足我的需要，但唯一的问题是它对于正在使用/保存的机器/浏览器来说是本地的。对此，我没有访问经典MySQL样式表的权限。我想扩展或调整我的本地存储，以便将其应用于其他浏览器；或者将我的用户设置存储在用户JS对象和JS对象属性中 我喜欢为每个用户创建JSON或JavaScript对象的想法，每当有新用户时，使用名称创建一个对象或带
localStorage我喜欢使用本地存储API保存简单用户设置的实现。我在一个web应用程序中使用它来满足我的需要，但唯一的问题是它对于正在使用/保存的机器/浏览器来说是本地的。对此，我没有访问经典MySQL样式表的权限。我想扩展或调整我的本地存储，以便将其应用于其他浏览器；或者将我的用户设置存储在用户JS对象和JS对象属性中
- 我喜欢为每个用户创建JSON或JavaScript对象的想法，每当有新用户时，使用名称创建一个对象或带有名称的
，并首先使用字段属性默认变量，并且在用户保存变量时填充或覆盖变量object[key] - 或者，如果上述情况不受欢迎；希望保留我的localstorage实现，因为它工作得很好，并且 某种类型的插件/库/扩展，允许我保存 这将在不同的位置重新渲染；这应该是 想起以前。虽然我很愿意把它保留在客户端；我是 打开node.js解决方案以及python解决方案，一个简单的 各种类型的数据框架应该足够工作了
- 用我的
数据生成一个文件怎么样？可能是一个.csv文件（这是非敏感数据），并让它像mylocalStorage
那样更新localStorage
至少我认为它比cvs好，因为您可以定义几个表，这是一个更具可伸缩性、更高效的数据库。您可以使用一个名为
localfourlocalStoragenodejsasyncwait在这里，您可以找到示例用法以及如何以您喜欢的方式在项目中实现它。我在这里添加了我的两分钱
导出/导入文件（JSON、XML、CSV、TSV等） 导出：
<!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>Settings Export/Import Demo</title>
</head>
<body>
<div id="display"></div> <br>
<button onclick="exportSettings();">Export</button>
<button onclick="resetSettings();">Reset</button> <br><br>
File to import: <input id="file-input" type="file" accept="application/json"> <br>
<button onclick="importSettings();">Import</button>
<script>
function exportSettings() {
var json = getSettingsAsJSON();
var blob = new Blob([json], { type: "application/json" });
var linkElement = document.createElement("a");
linkElement.href = URL.createObjectURL(blob);
linkElement.download = "ThisIsMySettings";
document.body.appendChild(linkElement);
linkElement.click();
document.body.removeChild(linkElement);
}
function importSettings() {
var fileInput = document.getElementById("file-input");
if (fileInput.files.length > 0) {
var jsonFile = fileInput.files[0];
var fileReader = new FileReader();
fileReader.onload = function (e) {
var json = e.target.result;
try {
var settings = JSON.parse(json);
if (settings.hasOwnProperty("userId")) {
localStorage["myapp_user_id"] = settings.userId;
}
if (settings.hasOwnProperty("hello")) {
localStorage["myapp_hello"] = settings.hello;
}
if (settings.hasOwnProperty("data")) {
localStorage["myapp_data"] = settings.data;
}
displaySettings();
} catch (ex) {
console.error(ex);
alert("Error occured while importing settings!");
}
};
fileReader.readAsText(jsonFile);
}
}
function resetSettings() {
localStorage["myapp_user_id"] = Math.floor(Math.random() * 100000) + 1;
localStorage["myapp_hello"] = "Hello World!";
localStorage["myapp_data"] = JSON.stringify([1, 3, 3, 7]);
displaySettings();
}
function displaySettings() {
var json = getSettingsAsJSON();
document.getElementById("display").innerText = json;
}
function getSettingsAsJSON() {
return JSON.stringify({
userId: localStorage["myapp_user_id"],
hello: localStorage["myapp_hello"],
data: localStorage["myapp_data"]
});
}
resetSettings();
</script>
</body>
</html>
<!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>Settings Export/Import Demo</title>
</head>
<body>
<div id="display"></div> <br>
<button onclick="exportSettings();">Export</button>
<button onclick="resetSettings();">Reset</button> <br><br>
File to import: <input id="file-input" type="file" accept="application/json"> <br>
<button onclick="importSettings();">Import</button>
<script>
function exportSettings() {
var json = getSettingsAsJSON();
var blob = new Blob([json], { type: "application/json" });
var linkElement = document.createElement("a");
linkElement.href = URL.createObjectURL(blob);
linkElement.download = "ThisIsMySettings";
document.body.appendChild(linkElement);
linkElement.click();
document.body.removeChild(linkElement);
}
function importSettings() {
var fileInput = document.getElementById("file-input");
if (fileInput.files.length > 0) {
var jsonFile = fileInput.files[0];
var fileReader = new FileReader();
fileReader.onload = function (e) {
var json = e.target.result;
try {
var settings = JSON.parse(json);
if (settings.hasOwnProperty("userId")) {
localStorage["myapp_user_id"] = settings.userId;
}
if (settings.hasOwnProperty("hello")) {
localStorage["myapp_hello"] = settings.hello;
}
if (settings.hasOwnProperty("data")) {
localStorage["myapp_data"] = settings.data;
}
displaySettings();
} catch (ex) {
console.error(ex);
alert("Error occured while importing settings!");
}
};
fileReader.readAsText(jsonFile);
}
}
function resetSettings() {
localStorage["myapp_user_id"] = Math.floor(Math.random() * 100000) + 1;
localStorage["myapp_hello"] = "Hello World!";
localStorage["myapp_data"] = JSON.stringify([1, 3, 3, 7]);
displaySettings();
}
function displaySettings() {
var json = getSettingsAsJSON();
document.getElementById("display").innerText = json;
}
function getSettingsAsJSON() {
return JSON.stringify({
userId: localStorage["myapp_user_id"],
hello: localStorage["myapp_hello"],
data: localStorage["myapp_data"]
});
}
resetSettings();
</script>
</body>
</html>
<!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>Settings Export/Import Demo</title>
</head>
<body>
<div id="display"></div> <br>
<button onclick="exportSettings();">Export</button>
<button onclick="resetSettings();">Reset</button> <br><br>
File to import: <input id="file-input" type="file" accept="application/json"> <br>
<button onclick="importSettings();">Import</button>
<script>
function exportSettings() {
var json = getSettingsAsJSON();
var blob = new Blob([json], { type: "application/json" });
var linkElement = document.createElement("a");
linkElement.href = URL.createObjectURL(blob);
linkElement.download = "ThisIsMySettings";
document.body.appendChild(linkElement);
linkElement.click();
document.body.removeChild(linkElement);
}
function importSettings() {
var fileInput = document.getElementById("file-input");
if (fileInput.files.length > 0) {
var jsonFile = fileInput.files[0];
var fileReader = new FileReader();
fileReader.onload = function (e) {
var json = e.target.result;
try {
var settings = JSON.parse(json);
if (settings.hasOwnProperty("userId")) {
localStorage["myapp_user_id"] = settings.userId;
}
if (settings.hasOwnProperty("hello")) {
localStorage["myapp_hello"] = settings.hello;
}
if (settings.hasOwnProperty("data")) {
localStorage["myapp_data"] = settings.data;
}
displaySettings();
} catch (ex) {
console.error(ex);
alert("Error occured while importing settings!");
}
};
fileReader.readAsText(jsonFile);
}
}
function resetSettings() {
localStorage["myapp_user_id"] = Math.floor(Math.random() * 100000) + 1;
localStorage["myapp_hello"] = "Hello World!";
localStorage["myapp_data"] = JSON.stringify([1, 3, 3, 7]);
displaySettings();
}
function displaySettings() {
var json = getSettingsAsJSON();
document.getElementById("display").innerText = json;
}
function getSettingsAsJSON() {
return JSON.stringify({
userId: localStorage["myapp_user_id"],
hello: localStorage["myapp_hello"],
data: localStorage["myapp_data"]
});
}
resetSettings();
</script>
</body>
</html>
设置导出/导入演示
出口
重置
要导入的文件：
进口
函数exportSettings（）{
var json=getSettingsAsJSON（）；
var blob=new blob（[json]，{type:“application/json”}）；
var linkElement=document.createElement（“a”）；
linkElement.href=URL.createObjectURL（blob）；
linkElement.download=“ThisIsMySettings”；
document.body.appendChild（linkElement）；
linkElement.click（）；
document.body.removeChild（linkElement）；
}
函数导入设置（）{
var fileInput=document.getElementById（“文件输入”）；
如果（fileInput.files.length>0）{
var jsonFile=fileInput.files[0]；
var fileReader=newfilereader（）；
fileReader.onload=函数（e）{
var json=e.target.result；
试一试{
var settings=JSON.parse（JSON）；
if（settings.hasOwnProperty（“userId”））{
localStorage[“myapp\u user\u id”]=settings.userId；
}
if（settings.hasOwnProperty（“hello”））{
localStorage[“myapp_hello”]=settings.hello；
}
if（settings.hasOwnProperty（“数据”））{
localStorage[“myapp_数据”]=settings.data；
}
显示设置（）；
}捕获（ex）{
控制台错误（ex）；
警报（“导入设置时出错！”）；
}
};
readAsText（jsonFile）；
}
}
函数重置设置（）{
localStorage[“myapp\u user\u id”]=Math.floor（Math.random（）*100000）+1；
本地存储[“myapp_hello”]=“hello World！”；
localStorage[“myapp_data”]=JSON.stringify（[1,3,3,7]）；
显示设置（）；
}
函数displaySettings（）{
var json=getSettingsAsJSON（）；
document.getElementById（“display”）.innerText=json；
}
函数getSettingsAsJSON（）{
返回JSON.stringify({
userId:localStorage[“myapp\u user\u id”]，
你好：localStorage[“myapp_你好”]，
数据：本地存储[“myapp_数据”]
});
}
重置设置（）；
URL（查询字符串） 导出：
<!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>Settings Export/Import Demo</title>
</head>
<body>
<div id="display"></div> <br>
<button onclick="exportSettings();">Export</button>
<button onclick="resetSettings();">Reset</button> <br><br>
File to import: <input id="file-input" type="file" accept="application/json"> <br>
<button onclick="importSettings();">Import</button>
<script>
function exportSettings() {
var json = getSettingsAsJSON();
var blob = new Blob([json], { type: "application/json" });
var linkElement = document.createElement("a");
linkElement.href = URL.createObjectURL(blob);
linkElement.download = "ThisIsMySettings";
document.body.appendChild(linkElement);
linkElement.click();
document.body.removeChild(linkElement);
}
function importSettings() {
var fileInput = document.getElementById("file-input");
if (fileInput.files.length > 0) {
var jsonFile = fileInput.files[0];
var fileReader = new FileReader();
fileReader.onload = function (e) {
var json = e.target.result;
try {
var settings = JSON.parse(json);
if (settings.hasOwnProperty("userId")) {
localStorage["myapp_user_id"] = settings.userId;
}
if (settings.hasOwnProperty("hello")) {
localStorage["myapp_hello"] = settings.hello;
}
if (settings.hasOwnProperty("data")) {
localStorage["myapp_data"] = settings.data;
}
displaySettings();
} catch (ex) {
console.error(ex);
alert("Error occured while importing settings!");
}
};
fileReader.readAsText(jsonFile);
}
}
function resetSettings() {
localStorage["myapp_user_id"] = Math.floor(Math.random() * 100000) + 1;
localStorage["myapp_hello"] = "Hello World!";
localStorage["myapp_data"] = JSON.stringify([1, 3, 3, 7]);
displaySettings();
}
function displaySettings() {
var json = getSettingsAsJSON();
document.getElementById("display").innerText = json;
}
function getSettingsAsJSON() {
return JSON.stringify({
userId: localStorage["myapp_user_id"],
hello: localStorage["myapp_hello"],
data: localStorage["myapp_data"]
});
}
resetSettings();
</script>
</body>
</html>
<!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>Settings Export/Import Demo</title>
</head>
<body>
<div id="display"></div> <br>
<button onclick="exportSettings();">Export</button>
<button onclick="resetSettings();">Reset</button> <br><br>
File to import: <input id="file-input" type="file" accept="application/json"> <br>
<button onclick="importSettings();">Import</button>
<script>
function exportSettings() {
var json = getSettingsAsJSON();
var blob = new Blob([json], { type: "application/json" });
var linkElement = document.createElement("a");
linkElement.href = URL.createObjectURL(blob);
linkElement.download = "ThisIsMySettings";
document.body.appendChild(linkElement);
linkElement.click();
document.body.removeChild(linkElement);
}
function importSettings() {
var fileInput = document.getElementById("file-input");
if (fileInput.files.length > 0) {
var jsonFile = fileInput.files[0];
var fileReader = new FileReader();
fileReader.onload = function (e) {
var json = e.target.result;
try {
var settings = JSON.parse(json);
if (settings.hasOwnProperty("userId")) {
localStorage["myapp_user_id"] = settings.userId;
}
if (settings.hasOwnProperty("hello")) {
localStorage["myapp_hello"] = settings.hello;
}
if (settings.hasOwnProperty("data")) {
localStorage["myapp_data"] = settings.data;
}
displaySettings();
} catch (ex) {
console.error(ex);
alert("Error occured while importing settings!");
}
};
fileReader.readAsText(jsonFile);
}
}
function resetSettings() {
localStorage["myapp_user_id"] = Math.floor(Math.random() * 100000) + 1;
localStorage["myapp_hello"] = "Hello World!";
localStorage["myapp_data"] = JSON.stringify([1, 3, 3, 7]);
displaySettings();
}
function displaySettings() {
var json = getSettingsAsJSON();
document.getElementById("display").innerText = json;
}
function getSettingsAsJSON() {
return JSON.stringify({
userId: localStorage["myapp_user_id"],
hello: localStorage["myapp_hello"],
data: localStorage["myapp_data"]
});
}
resetSettings();
</script>
</body>
</html>
Base64编码数据 导出：
<!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>Settings Export/Import Demo</title>
</head>
<body>
<div id="display"></div> <br>
<button onclick="exportSettings();">Export</button>
<button onclick="resetSettings();">Reset</button> <br><br>
File to import: <input id="file-input" type="file" accept="application/json"> <br>
<button onclick="importSettings();">Import</button>
<script>
function exportSettings() {
var json = getSettingsAsJSON();
var blob = new Blob([json], { type: "application/json" });
var linkElement = document.createElement("a");
linkElement.href = URL.createObjectURL(blob);
linkElement.download = "ThisIsMySettings";
document.body.appendChild(linkElement);
linkElement.click();
document.body.removeChild(linkElement);
}
function importSettings() {
var fileInput = document.getElementById("file-input");
if (fileInput.files.length > 0) {
var jsonFile = fileInput.files[0];
var fileReader = new FileReader();
fileReader.onload = function (e) {
var json = e.target.result;
try {
var settings = JSON.parse(json);
if (settings.hasOwnProperty("userId")) {
localStorage["myapp_user_id"] = settings.userId;
}
if (settings.hasOwnProperty("hello")) {
localStorage["myapp_hello"] = settings.hello;
}
if (settings.hasOwnProperty("data")) {
localStorage["myapp_data"] = settings.data;
}
displaySettings();
} catch (ex) {
console.error(ex);
alert("Error occured while importing settings!");
}
};
fileReader.readAsText(jsonFile);
}
}
function resetSettings() {
localStorage["myapp_user_id"] = Math.floor(Math.random() * 100000) + 1;
localStorage["myapp_hello"] = "Hello World!";
localStorage["myapp_data"] = JSON.stringify([1, 3, 3, 7]);
displaySettings();
}
function displaySettings() {
var json = getSettingsAsJSON();
document.getElementById("display").innerText = json;
}
function getSettingsAsJSON() {
return JSON.stringify({
userId: localStorage["myapp_user_id"],
hello: localStorage["myapp_hello"],
data: localStorage["myapp_data"]
});
}
resetSettings();
</script>
</body>
</html>
<!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>Settings Export/Import Demo</title>
</head>
<body>
<div id="display"></div> <br>
<button onclick="exportSettings();">Export</button>
<button onclick="resetSettings();">Reset</button> <br><br>
File to import: <input id="file-input" type="file" accept="application/json"> <br>
<button onclick="importSettings();">Import</button>
<script>
function exportSettings() {
var json = getSettingsAsJSON();
var blob = new Blob([json], { type: "application/json" });
var linkElement = document.createElement("a");
linkElement.href = URL.createObjectURL(blob);
linkElement.download = "ThisIsMySettings";
document.body.appendChild(linkElement);
linkElement.click();
document.body.removeChild(linkElement);
}
function importSettings() {
var fileInput = document.getElementById("file-input");
if (fileInput.files.length > 0) {
var jsonFile = fileInput.files[0];
var fileReader = new FileReader();
fileReader.onload = function (e) {
var json = e.target.result;
try {
var settings = JSON.parse(json);
if (settings.hasOwnProperty("userId")) {
localStorage["myapp_user_id"] = settings.userId;
}
if (settings.hasOwnProperty("hello")) {
localStorage["myapp_hello"] = settings.hello;
}
if (settings.hasOwnProperty("data")) {
localStorage["myapp_data"] = settings.data;
}
displaySettings();
} catch (ex) {
console.error(ex);
alert("Error occured while importing settings!");
}
};
fileReader.readAsText(jsonFile);
}
}
function resetSettings() {
localStorage["myapp_user_id"] = Math.floor(Math.random() * 100000) + 1;
localStorage["myapp_hello"] = "Hello World!";
localStorage["myapp_data"] = JSON.stringify([1, 3, 3, 7]);
displaySettings();
}
function displaySettings() {
var json = getSettingsAsJSON();
document.getElementById("display").innerText = json;
}
function getSettingsAsJSON() {
return JSON.stringify({
userId: localStorage["myapp_user_id"],
hello: localStorage["myapp_hello"],
data: localStorage["myapp_data"]
});
}
resetSettings();
</script>
</body>
</html>