这个方法开箱即用，效果非常好

function getCookie(cname) {
  var cookies = ` ${document.cookie}`.split(";");
  var val = "";
  for (var i = 0; i < cookies.length; i++) {
    var cookie = cookies[i].split("=");
    if (cookie[0] == ` ${cname}`) {
      return cookie[1];
    }
  }
  return "";
}

我写了一些可能很容易使用的东西，如果有人有什么要补充的，请随时这样做。

function getcookie(name = '') {
    let cookies = document.cookie;
    let cookiestore = {};
    
    cookies = cookies.split(";");
    
    if (cookies[0] == "" && cookies[0][0] == undefined) {
        return undefined;
    }
    
    cookies.forEach(function(cookie) {
        cookie = cookie.split(/=(.+)/);
        if (cookie[0].substr(0, 1) == ' ') {
            cookie[0] = cookie[0].substr(1);
        }
        cookiestore[cookie[0]] = cookie[1];
    });
    
    return (name !== '' ? cookiestore[name] : cookiestore);
}

使用

Getcookie() -返回一个包含网页上所有cookie的对象。

getcookie('myCookie') -从cookie对象返回cookie myCookie的值，否则如果cookie为空或未设置则返回undefined。

例子

// Have some cookies :-)
document.cookie = "myCookies=delicious";
document.cookie = "myComputer=good";
document.cookie = "myBrowser=RAM hungry";

// Read them
console.log( "My cookies are " + getcookie('myCookie') );
// Outputs: My cookies are delicious

console.log( "My computer is " + getcookie('myComputer') );
// Outputs: My computer is good

console.log( "My browser is " + getcookie('myBrowser') );
// Outputs: My browser is RAM hungry

console.log( getcookie() );
// Outputs: {myCookie: "delicious", myComputer: "good", myBrowser: "RAM hungry"}

// (does cookie exist?)
if (getcookie('hidden_cookie')) {
    console.log('Hidden cookie was found!');
} else {
    console.log('Still no cookie :-(');
}

// (do any cookies exist?)
if (getcookie()) {
    console.log("You've got cookies to eat!");
} else {
    console.log('No cookies for today :-(');
}

Kirlich给出了一个很好的解决方案。然而，当有两个cookie值具有相似的名称时，它会失败，这里有一个简单的修复这种情况:

function getCookie(name) {
  var value = "; " + document.cookie;
  var parts = value.split("; " + name + "=");
  if (parts.length >= 2) return parts.pop().split(";").shift();
}

我喜欢使用闭包按名称获取cookie值。下面的闭包将允许您通过名称获取cookie值，但只有在更新了cookie字符串时才会解析cookie字符串。

您可以通过以下方法检索cookie的值:

var foo = cookies.get( "bar" );

代码:

var cookies = ( function() {
    var cookieString = null;
    var cookieArray = [];

    function getValOf( name ) {
        if ( newCookies() ) {
            parseCookieString()
        }
        return cookieArray[ name ];
    }

    // Check if new cookies have been added
    function newCookies() {
        return cookieString === document.cookie;
    }

    function parseCookieString() {
        cookieString = document.cookie;

        // Separate cookies
        var cookies = cookieString.split( ";" );

        // Empty previous cookies
        cookieArray = [];

        // Update cookieArray with new name-value pairs
        for ( var i in cookies ) {

            // Separate name and value
            var nameVal = cookies[ i ].split( "=" );
            var name = nameVal[ 0 ].trim();
            var value = nameVal[ 1 ].trim();

            // Add cookie name value pair to dictionary
            cookieArray[ name ] = value;
        }
    }

    return {

        /**
         * Returns value or undefined
         */
        get: function( name ) {
            return getValOf( name );
        }  
    };
})();

现在，当以数组格式存储cookie时，可以让cookie以数组形式返回。 例如，你的cookie数组[35]=Khóa;数组[36]= Tử;数组[37]= Cử; 这段代码也包含utf8。 当你的cookie名称内容[]在其中，而你存储的cookie不在数组中时，一件事不会很好地工作。

function getCookie(cname) {

            var ca = decodeURIComponent(document.cookie).split(';');


            if (cname.indexOf('[]') > 0) {
                var returnVAlue = [];
                var nameArray = cname.replace("[]", "");

                for(var i = 0; i < ca.length; i++) {
                    var c = ca[i];
                   // console.log(c);
                    while (c.charAt(0) == ' ') {
                        c = c.substring(1);
                    }

                    if (c.indexOf(nameArray) >= 0) {
                        var valueString = c.substr(nameArray.length, c.length);

                        var valueStringSlit = valueString.split('=');
                        valueStringSlit[0] = valueStringSlit[0].substr(1,(valueStringSlit[0].length - 2));
                    //    console.log(valueStringSlit);

                        returnVAlue.push(valueStringSlit);
                    }
                }
            } else {
                var returnVAlue = '';
                var name = cname + "=";

                for(var i = 0; i < ca.length; i++) {
                    var c = ca[i];
                   // console.log(c);
                    while (c.charAt(0) == ' ') {
                        c = c.substring(1);
                    }
                    if (c.indexOf(name) == 0) {
                        returnVAlue = c.substr(name.length, c.length);
                    } 
                }
            }


            if (returnVAlue != ''){
                return returnVAlue;
            } 
            return "";
        }

       // console.log(decodeURIComponent(document.cookie));


        console.log(getCookie('array[]'));

获取cookie名称的简单函数:

function getCookie(cn) {
    var name = cn+"=";
    var allCookie = decodeURIComponent(document.cookie).split(';');
    var cval = [];
    for(var i=0; i < allCookie.length; i++) {
        if (allCookie[i].trim().indexOf(name) == 0) {
            cval = allCookie[i].trim().split("=");
        }   
    }
    return (cval.length > 0) ? cval[1] : "";
}