Javascript 更改颜色并设置一个cookie

我对Javascript和堆栈溢出社区是新手。我创建了一个脚本来更改特定元素的样式，结果如下：

HTML:

JSFiddle：

我读了一些关于如何在JavaScript中使用Cookie的手册，但我对如何使用它们还不清楚。我想问一下，是否有人可以用这个脚本向我展示如何设置cookie：当有人更改颜色时，单击id为绿色或波尔多的span，信息将被存储，如果刷新页面，则在用户清理浏览器缓存之前，页面将保持所选颜色。 这样我就可以清楚地知道应该如何使用它们

致以最良好的祝愿，

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基尔这把小提琴应该能用

对于这个答案，我使用了Mandeep Janjua发布的第二个答案中的代码片段

    function createCookie(name,value,days) {
    if (days) {
        var date = new Date();
        date.setTime(date.getTime()+(days*24*60*60*1000));
        var expires = "; expires="+date.toGMTString();
    }
    else var expires = "";
    document.cookie = name+"="+value+expires+"; path=/";
}

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

function eraseCookie(name) {
    createCookie(name,"",-1);
}

document.getElementById("green").onclick = function() {colorGreen()};
document.getElementById("bordeaux").onclick = function() {colorBordeaux()};
var x = readCookie('color')
if (x === 'green') {
    colorGreen();
} else if(x === 'bordeaux'){
 colorBordeaux();   
}

function colorGreen() {
    document.getElementById("menu").style.borderBottom = "3px solid #448F44";
    document.getElementById("cols_1").style.borderTop = "3px solid #448F44";
    document.getElementById("cols_2").style.borderTop = "3px solid #448F44";
    createCookie('color','green',7);
}
function colorBordeaux() {
    document.getElementById("menu").style.borderBottom = "3px solid #E8920C";
    document.getElementById("cols_1").style.borderTop = "3px solid #E8920C";
    document.getElementById("cols_2").style.borderTop = "3px solid #E8920C";
    createCookie('color','bordeaux',7);
}

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不确定你是否读过，但这提供了一个非常好的概述，应该可以帮助你回答问题：谢谢你的参考：刚刚修复了代码，我错误地上传了旧代码。@Keaire没问题，如果你需要任何帮助理解它，请尽管问。

document.getElementById("green").onclick = function() {colorGreen()};
document.getElementById("bordeaux").onclick = function() {colorBordeaux()};
function colorGreen() {
    document.getElementById("menu").style.borderBottom = "3px solid #448F44";
    document.getElementById("cols_1").style.borderTop = "3px solid #448F44";
    document.getElementById("cols_2").style.borderTop = "3px solid #448F44";
}
function colorBordeaux() {
    document.getElementById("menu").style.borderBottom = "3px solid #E8920C";
    document.getElementById("cols_1").style.borderTop = "3px solid #E8920C";
    document.getElementById("cols_2").style.borderTop = "3px solid #E8920C";
}

    function createCookie(name,value,days) {
    if (days) {
        var date = new Date();
        date.setTime(date.getTime()+(days*24*60*60*1000));
        var expires = "; expires="+date.toGMTString();
    }
    else var expires = "";
    document.cookie = name+"="+value+expires+"; path=/";
}

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

function eraseCookie(name) {
    createCookie(name,"",-1);
}

document.getElementById("green").onclick = function() {colorGreen()};
document.getElementById("bordeaux").onclick = function() {colorBordeaux()};
var x = readCookie('color')
if (x === 'green') {
    colorGreen();
} else if(x === 'bordeaux'){
 colorBordeaux();   
}

function colorGreen() {
    document.getElementById("menu").style.borderBottom = "3px solid #448F44";
    document.getElementById("cols_1").style.borderTop = "3px solid #448F44";
    document.getElementById("cols_2").style.borderTop = "3px solid #448F44";
    createCookie('color','green',7);
}
function colorBordeaux() {
    document.getElementById("menu").style.borderBottom = "3px solid #E8920C";
    document.getElementById("cols_1").style.borderTop = "3px solid #E8920C";
    document.getElementById("cols_2").style.borderTop = "3px solid #E8920C";
    createCookie('color','bordeaux',7);
}