当我的网站上有多个cookie时,我的javascript代码不起作用。我不知道如何在javascript中指定cookie名称,因为我缺乏经验。饼干正在削弱萎缩的背景颜色。
有人知道我做错了吗?
这是我的代码。
<div>
<article id="bg">
<h1>Kies een kleur en kijk wat voor cookie er wordt aangemaakt</h1>
<select id="theme" onchange="setColorCookie()">
<option value="Select Color">Kies een kleur</option>
<option value="red">Rood</option>
<option value="orange">Oranje</option>
<option value="yellow">Geel</option>
<option value="green">Groen</option>
<option value="blue">Blauw</option>
<option value="purple">Paars</option>
<option value="pink">Roze</option>
<option value="brown">Bruin</option>
<option value="black">Zwart</option>
<option value="white">Wit</option>
</select>
</article>
<script type="text/javascript">
window.onload = function ()
{
if (document.cookie.length != 0) {
var nameValueArray = document.cookie.split("=");
document.getElementById("theme").value = nameValueArray[1];
document.getElementById("bg").style.backgroundColor = nameValueArray[1];
}
}
function setColorCookie()
{
var selectedValue = document.getElementById("theme").value;
if (selectedValue != "Select Color")
{
document.getElementById("bg").style.backgroundColor = selectedValue;
document.cookie = "color=" + selectedValue + ";expires=Fri, 5 2019 01:00:00 UTC;";
}
}
</script>
</div>
看看w3schools:
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 ca = document.cookie.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 "";
}
function checkCookie() {
var user = getCookie("username");
if (user != "") {
alert("Welcome again " + user);
} else {
user = prompt("Please enter your name:", "");
if (user != "" && user != null) {
setCookie("username", user, 365);
}
}
}
看这里:MDN: Document.cookie或在这里:JavaScript Cookies。
而不是var nameValueArray = document.cookie.split("=");
,你应该做const myCookies = document.cookie.split(";");
。因为:
https://developer.mozilla.org/en-US/docs/Web/API/Document/cookie
allCookies = document.cookie;
在上面的代码中,
allCookies
是一个字符串,包含一个以分号分隔的所有cookie列表(即key = value对)。
例如:
allCookies = document.cookie; // allCookies <= "cookie1=cow; cookie2 = pig; cookie3= chicken;"
cookiesArray = allCookies.split(';'); // cookiesArray[] <= ["cookie1=cow", "cookie2 = pig", "cookie3= chicken"]
还有一个建议:
<script type="text/javascript">
window.onload = function () {
const allCookies = document.cookie;
const cookiesArray = allCookies.split(';');
alert('allCookies:' + allCookies);
alert('cookiesArray:' + JSON.stringify(cookiesArray));
if (document.cookie.length != 0) {
...