如何在JavaScript中创建和读取cookie的值?
当前回答
这是一个代码获取,设置和删除Cookie在JavaScript。
function getCookie(name) { name = name + "="; var cookies = document.cookie.split(';'); for(var i = 0; i <cookies.length; i++) { var cookie = cookies[i]; while (cookie.charAt(0)==' ') { cookie = cookie.substring(1); } if (cookie.indexOf(name) == 0) { return cookie.substring(name.length,cookie.length); } } return ""; } function setCookie(name, value, expirydays) { var d = new Date(); d.setTime(d.getTime() + (expirydays*24*60*60*1000)); var expires = "expires="+ d.toUTCString(); document.cookie = name + "=" + value + "; " + expires; } function deleteCookie(name){ setCookie(name,"",-1); }
来源:http://mycodingtricks.com/snippets/javascript/javascript-cookies/
其他回答
我用这个物体。值是经过编码的,所以在从服务器端读写时必须考虑到这一点。
cookie = (function() {
/**
* Sets a cookie value. seconds parameter is optional
*/
var set = function(name, value, seconds) {
var expires = seconds ? '; expires=' + new Date(new Date().getTime() + seconds * 1000).toGMTString() : '';
document.cookie = name + '=' + encodeURIComponent(value) + expires + '; path=/';
};
var map = function() {
var map = {};
var kvs = document.cookie.split('; ');
for (var i = 0; i < kvs.length; i++) {
var kv = kvs[i].split('=');
map[kv[0]] = decodeURIComponent(kv[1]);
}
return map;
};
var get = function(name) {
return map()[name];
};
var remove = function(name) {
set(name, '', -1);
};
return {
set: set,
get: get,
remove: remove,
map: map
};
})();
JQuery cookie
或纯Javascript:
function setCookie(c_name,value,exdays)
{
var exdate=new Date();
exdate.setDate(exdate.getDate() + exdays);
var c_value=escape(value) + ((exdays==null) ? "" : ("; expires="+exdate.toUTCString()));
document.cookie=c_name + "=" + c_value;
}
function getCookie(c_name)
{
var i,x,y,ARRcookies=document.cookie.split(";");
for (i=0; i<ARRcookies.length; i++)
{
x=ARRcookies[i].substr(0,ARRcookies[i].indexOf("="));
y=ARRcookies[i].substr(ARRcookies[i].indexOf("=")+1);
x=x.replace(/^\s+|\s+$/g,"");
if (x==c_name)
{
return unescape(y);
}
}
}
简约且功能齐全的ES6方法:
const setCookie = (name, value, days = 7, path = '/') => {
const expires = new Date(Date.now() + days * 864e5).toUTCString()
document.cookie = name + '=' + encodeURIComponent(value) + '; expires=' + expires + '; path=' + path
}
const getCookie = (name) => {
return document.cookie.split('; ').reduce((r, v) => {
const parts = v.split('=')
return parts[0] === name ? decodeURIComponent(parts[1]) : r
}, '')
}
const deleteCookie = (name, path) => {
setCookie(name, '', -1, path)
}
readCookie的改进版本:
function readCookie( name )
{
var cookieParts = document.cookie.split( ';' )
, i = 0
, part
, part_data
, value
;
while( part = cookieParts[ i++ ] )
{
part_data = part.split( '=' );
if ( part_data.shift().replace(/\s/, '' ) === name )
{
value = part_data.shift();
break;
}
}
return value;
}
一旦你找到你的cookie值并返回它的值,它就会被打破。在我看来,双劈非常优雅。
if条件上的替换是一个空白修饰,以确保它正确匹配
对于那些需要保存{foo: 'bar'}这样的对象的人,我分享了我编辑过的@KevinBurke的答案。我添加了JSON。stringify和JSON。解析,仅此而已。
cookie = {
set: function (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 + "=" + JSON.stringify(value) + expires + "; path=/";
},
get : function(name){
var nameEQ = name + "=",
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 JSON.parse(c.substring(nameEQ.length,c.length));
}
return null;
}
}
现在你可以这样做:
cookie.set('cookie_key', {foo: 'bar'}, 30);
cookie.get('cookie_key'); // {foo: 'bar'}
cookie.set('cookie_key', 'baz', 30);
cookie.get('cookie_key'); // 'baz'