我正在学习学习和获取cookie。我有一个简单的表格,用户设置了cookie,然后尝试检索cookie值。我将document.cookie
字符串分为部分,并寻找与给定名称匹配的现有cookie名称。当我找到要寻找的名称时,也许是"a"
时,我有一个测试名称"a"
和一个等于"a"
的曲奇件,但它们的注册并不等于。
在表单中,输入" A"," B",套件中的1个,在Get Cookie表单中输入" A"。警报将显示我的意思。
代码以下和:http://plnkr.co/edit/gy2uoez1g5lyoub8oee1?p=preview
我更喜欢jsfiddle,但它会弄乱饼干。
index.html
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Cookie Test</title>
<meta name="description" content="Cookie Test">
<!--link rel="stylesheet" href="css/styles.css?v=1.0"-->
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script src="cookie_test.js"></script>
<script type="text/javascript">
//$(document).ready(function(){alert("document ready");});
</script>
</head>
<body>
<form id="set-cookie-form">
<fieldset>
<legend>Set Cookie</legend>
<label>Name</label>
<input type="text" name="set-name" id="set-name" />
<label>Value</label>
<input type="text" name="set-value" id="set-value" />
<label>Value</label>
<input type="number" name="set-days" id="set-days" />
<input type="button" name="set-cookie" id="set-cookie" value="Set Cookie" />
<p>Cookie String: <span id="cookie-text"></span></p>
</fieldset>
</form>
<form id="get-cookie-form">
<fieldset>
<legend>Get Cookie</legend>
<label>Name</label>
<input type="text" name="get-name" id="get-name" />
<input type="button" name="get-cookie" id="get-cookie" value="Get Cookie" />
<p>Cookie Value: <span id="cookie-value"></span></p>
</fieldset>
</form>
</body>
</html>
cookie_test.js
$(document).ready(function(){
$('#set-cookie').on('click', function(){
//alert("set cookie clicked");
setCookie($('#set-name').val(), $('#set-value').val(), $('#set-days').val());
});
$('#get-cookie').on('click', function(){
//alert("get cookie clicked");
var value = getCookie($('#get-name').val());
$('#cookie-value').text(value);
});
});
function setCookie(name, value, num_days) {
var cookie_text = name + "=" + value;
var expires = "";
if (num_days > 0) {
var date = new Date();
date.setTime(date.getTime() + (num_days * 24 * 60 * 60 * 1000));
expires = "; expires=" + date.toGMTString();
} else {
expires = "";
}
cookie_text += expires + "; path=/";
//alert(cookie_text);
document.cookie = cookie_text;
$('#cookie-text').text(cookie_text);
//alert(document.cookie);
}
function getCookie(name) {
//alert("get cookie " + name);
var current_cookie = document.cookie;
//alert("current cookie: " + current_cookie);
var cookie_pieces = current_cookie.split(';');
//alert(cookie_pieces[0]);
for (var i = 0; i < cookie_pieces.length; i++) {
//alert(cookie_pieces[i]);
var key_val_pair = cookie_pieces[i].split("=");
var current_key = key_val_pair[0];
alert(
"name="+name+";"+"type of name="+(typeof name)+";"
+"current_key="+current_key+";"
+"typeof current_key="+(typeof current_key)+";"
+"(current_key==name)="+(current_key==name)
);
if (key_val_pair[0] == name) {
alert("found it");
$('#cookie-value').text(key_val_pair[1]);
return key_val_pair[1];
}
}
return null;
}
function eraseCookie(name) {
createCookie(name, "", -1);
}
仔细查看alert(document.cookie)
警报。似乎它返回的字符串中的键值对彼此分开,半隆(;
)和whitespace()。因此,您需要对此分开。
不这样做,您的比较看起来像这样,因为没有删除额外的空格:
'a' == ' a' // False!
您需要更改的只是此行:
var cookie_pieces = current_cookie.split(';');
到此:
var cookie_pieces = current_cookie.split('; ');
http://plnkr.co/edit/wkbfd7pu10cmwjqxyip0?p = preview
从运行它通过它运行它正在用" a"返回迭代的key_val_pair [0]的值
我通过为空间添加替换并解决了您的问题来修复它。我还将变量名称固定为您的current_key,但随后进行了if语句为(key_val_pair [0] ==名称),因此它不会使用新格式进行检查。
function getCookie(name) {
//alert("get cookie " + name);
var current_cookie = document.cookie;
//alert("current cookie: " + current_cookie);
var cookie_pieces = current_cookie.split(';');
//alert(cookie_pieces[0]);
for (var i = 0; i < cookie_pieces.length; i++) {
//alert(cookie_pieces[i]);
var key_val_pair = cookie_pieces[i].split("=");
var current_key = key_val_pair[0].replace(" ", "");
alert(
"name="+name+";"+"type of name="+(typeof name)+";"
+"current_key="+current_key+";"
+"typeof current_key="+(typeof current_key)+";"
+"(current_key==name)="+(current_key==name)
);
if (current_key == name) {
alert("found it");
$('#cookie-value').text(current_key);
return current_key;
}
}
return null;
}