当用户使用Javascript单击按钮时,我会尝试覆盖Cookie值。我想用onclick按钮中的新值替换默认的cookie值。我尝试在这里学习教程:https://www.quirksmode.org/js/cookies.html,但它并没有真正深入到关于实际按钮/超级链接的功能的细节。看起来他只需使用createCookie函数就可以更新/覆盖cookie,但无论我尝试做什么,它都不起作用。下面是我的代码:
<script>
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;
}
document.cookie = "sbhlocation_city=Muncie";
document.cookie = "sbhlocation_state=IN";
var setLocationCity = document.cookie.replace(/(?:(?:^|.*;\s*)sbhlocation_city\s*\=\s*([^;]*).*$)|^.*$/, "$1");
var setLocationState = document.cookie.replace(/(?:(?:^|.*;\s*)sbhlocation_state\s*\=\s*([^;]*).*$)|^.*$/, "$1");
</script>
<p class="body-text">
<script>
document.write(setLocationCity);
</script>
</p>
<p class="body-text">
<script>
document.write(setLocationState);
</script>
</p>
<button onclick="createCookie('sbhlocation_city','Waco',365)" href="#">Set City to Waco</button>
City的默认Cookie值应该是Muncie,但button onlick需要将City的Cookie值更改为Waco。当我尝试它时,城市没有更新。我是Javascript的新手,所以任何帮助都是非常感谢的。谢谢!
发布于 2018-08-07 04:03:14
尝试对您的代码进行此更正:
<button onclick="createCookie('sbhlocation_city','Waco',365)" href="#">Set City to Waco</button>
问题是"sbhlocation_city“不是一个变量,而是一个文本。“韦科”也是如此。如果没有'thisthingsaroundme‘,它就会被当作变量名。所以它会抛出一个"is undefined“错误。
https://stackoverflow.com/questions/51714284
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