当用户单击按钮并使用Javascript时,我试图覆盖Cookie值。我想用onclick按钮中的新值替换默认的cookie值。我尝试在此处遵循该教程:https://www.quirksmode.org/js/cookies.html,但实际上并没有涉及有关实际按钮/超链接功能的详细信息。看起来他仅使用createCookie函数就能够更新/覆盖cookie,但是无论我如何尝试都行不通。这是我的代码如下:
<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>
“城市”的默认cookie值应为Muncie,但是onlick按钮需要将“城市”的cookie值更改为Waco。当我尝试时,城市不会更新。我是Java的新手,因此非常感谢您的帮助。谢谢!
答案 0 :(得分:0)
尝试对此代码进行更正:
<button onclick="createCookie('sbhlocation_city','Waco',365)" href="#">Set City to Waco</button>
问题是“ sbhlocation_city”不是变量,是文本。 “ Waco”也是如此。 没有“ thisthingsaroundme”,它被当作变量名。因此会引发“未定义”错误。