Javascript recovery settings code: one-click factory settings

With the popularity of mobile devices and computers, our lives are inseparable from these electronic products. Whether in the office or at home, we all need to use a variety of software tools to complete work and entertainment. However, sometimes we may need to perform one-click recovery settings on certain software or devices to restore normal working conditions.

Javascript is a programming language widely used for Web front-end development, and in JavaScript, there are many practical techniques that can help us achieve the function of restoring settings with one click. In this article, we will introduce how to use Javascript to implement one-click factory reset.

1. What is Javascript?

JavaScript is a prototype-based, interpreted scripting language and a very commonly used front-end language for adding dynamics and interactivity to web browsers. JavaScript was created in 1995 by Brendan Eich, who was a programmer at Netscape.

The main features of Javascript are: easy to learn and use, syntax introduction, structure, readability, etc. It can be used in conjunction with HTML and CSS to provide dynamic effects, form validation and other functions for web pages.

2. Javascript realizes the function of restoring settings

In Javascript, we can write our own code according to our needs to realize the function of restoring settings. Next, we will introduce two common implementation methods: using Cookies and using LocalStorage.

1. Using Cookies

The method of restoring settings using Cookies mainly uses the Cookies function of the browser to store user configuration information. The code is as follows:

//Set Cookie
function setCook(name, value, expires, path, domain, secure) {

var cookie = encodeURIComponent(name) + "=" + encodeURIComponent(value);
expires && (cookie += ";expires=" + new Date(expires).toGMTString());
path && (cookie += ";path=" + path);
domain && (cookie += ";domain=" + domain);
secure && (cookie += ";secure");
document.cookie = cookie;

}

//Get Cookie
function getCook(name) {

var cookie = {};
var all = document.cookie;
if (all === "") {
    return cookie;
}
var list = all.split(";");
for (var i = 0; i < list.length; i++) {
    var c = list[i];
    var p = c.indexOf("=");
    var n = p > -1 ? c.substr(0, p) : c;
    var v = p > -1 ? decodeURIComponent(c.substr(p + 1)) : "";
    cookie[n.trim()] = v;
}
return name ? cookie[name] : cookie;

}

//Perform recovery settings
function resetSetting() {

setCook('my_setting', null, -1, '/');
alert('已经恢复到默认设置！');

}

Note: In this method, we use the setCook() and getCook() functions to set and get Cookie respectively. In the resetSetting() function, we can use the setCook() function to delete the cookie and restore it to the default settings.

2. Use LocalStorage to achieve

The recovery setting method using LocalStorage mainly uses the local storage function of the browser to store user configuration information. The code is as follows:

//Set LocalStorage
function setLocalStorage(key, value) {

if (window.localStorage) {
    window.localStorage.setItem(key, value);
} else {
    alert("您的浏览器不支持localStorage！");
}

}

//Get LocalStorage
function getLocalStorage(key) {

if (window.localStorage) {
    return window.localStorage.getItem(key);
} else {
    alert("您的浏览器不支持localStorage！");
    return "";
}

}

//Perform recovery settings
function resetSetting() {

localStorage.removeItem('my_setting');
alert('已经恢复到默认设置！');

}

Note: In this method, we The setLocalStorage() and getLocalStorage() functions are used to set and get LocalStorage respectively. In the resetSetting() function, we can use LocalStorage's removeItem() function to delete the configuration information and restore it to the default settings.

3. Summary

Through the above method, we can use Javascript to realize the one-click factory return setting function. Whether using Cookies or LocalStorage, both are very practical methods. Whether you're developing web applications or writing web pages, these tips can help you do your job better.

Of course, we also need to pay attention to some security issues, such as verifying the content entered by the user to avoid being attacked. At the same time, if we need to ensure the compatibility of the code, we also need to conduct some browser compatibility testing to ensure that the code we write can run correctly on various popular browsers.

Finally, if you want to further learn Javascript or other programming languages, you can refer to some related learning resources to learn related technologies more systematically.

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