如何在JavaScript中创建和读取cookie的值?


当前回答

我使用以下函数,这些函数是我从各种来源中找到的最好的函数,并剔除了一些错误或差异。

函数setCookie没有高级选项,只有简单的东西,但代码很容易理解,这总是一个优点:

function setCookie(name, value, daysToLive = 3650) { // 10 years default
  let cookie = name + "=" + encodeURIComponent(value);
  if (typeof daysToLive === "number") {
    cookie += "; max-age=" + (daysToLive * 24 * 60 * 60);
    document.cookie = cookie + ";path=/";
  }
}
function getCookie(name) {
  let cookieArr = document.cookie.split(";");
  for (let i = 0; i < cookieArr.length; i++) {
    let cookiePair = cookieArr[i].split("=");
    if (name == cookiePair[0].trim()) {
      return decodeURIComponent(cookiePair[1].trim());
    }
  }
  return undefined;
}
function deleteCookie(name) {
  setCookie(name, '', -1);
}

其他回答

我用js-cookie取得了成功。

<script src="/path/to/js.cookie.js"></script>
<script>
  Cookies.set('foo', 'bar');
  Cookies.get('foo');
</script>

Mozilla创建了一个简单的框架,用于读取和写入cookie,并提供了完整的unicode支持以及如何使用它的示例。

一旦包含在页面中,您可以设置cookie:

docCookies.setItem(name, value);

读饼干:

docCookies.getItem(name);

或者删除cookie:

docCookies.removeItem(name);

例如:

// sets a cookie called 'myCookie' with value 'Chocolate Chip'
docCookies.setItem('myCookie', 'Chocolate Chip');

// reads the value of a cookie called 'myCookie' and assigns to variable
var myCookie = docCookies.getItem('myCookie');

// removes the cookie called 'myCookie'
docCookies.removeItem('myCookie');

查看Mozilla文档中的更多示例和详细信息。饼干页面。

这个简单的js文件的一个版本在github上。

通过类似sessionStorage和localStorage的接口:

const cookieStorage = {
  getItem: (key) {
    const cookies = document.cookie.split(';')
      .map(cookie => cookie.split('='))
      .reduce(
        (accumulation, [key, value]) => ({...accumulation, [key.trim()]: value}),
        {}
      )
    
    return cookies[key]
  },
  setItem: (key, value) {
    document.cookie = `${key}=${value}`
  },
}

它的用法cookieStorage。setItem(", ")和cookieStorage.getItem(")。

下面是前面提到的w3schools的例子。

function setCookie(cname, cvalue, exdays) {
    var d = new Date();
    d.setTime(d.getTime() + (exdays*24*60*60*1000));
    var expires = "expires="+ d.toUTCString();
    document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
}

function getCookie(cname) {
    var name = cname + "=";
    var decodedCookie = decodeURIComponent(document.cookie);
    var ca = decodedCookie.split(';');
    for(var i = 0; i <ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0) == ' ') {
            c = c.substring(1);
        }
        if (c.indexOf(name) == 0) {
            return c.substring(name.length, c.length);
        }
    }
    return "";
}

我使用以下函数,这些函数是我从各种来源中找到的最好的函数,并剔除了一些错误或差异。

函数setCookie没有高级选项,只有简单的东西,但代码很容易理解,这总是一个优点:

function setCookie(name, value, daysToLive = 3650) { // 10 years default
  let cookie = name + "=" + encodeURIComponent(value);
  if (typeof daysToLive === "number") {
    cookie += "; max-age=" + (daysToLive * 24 * 60 * 60);
    document.cookie = cookie + ";path=/";
  }
}
function getCookie(name) {
  let cookieArr = document.cookie.split(";");
  for (let i = 0; i < cookieArr.length; i++) {
    let cookiePair = cookieArr[i].split("=");
    if (name == cookiePair[0].trim()) {
      return decodeURIComponent(cookiePair[1].trim());
    }
  }
  return undefined;
}
function deleteCookie(name) {
  setCookie(name, '', -1);
}