使用jQuery操作cookie之前需要引入jQuery的一个cookie小组件js，代码如下：
/*
jQuery cookie plugins
*/
jQuery.cookie = function(name, value, options) {
if (typeof value != ‘undefined‘) { // name and value given, set cookie
options = options || {};
if (value === null) {
value = ‘‘;
options.expires = -1;
}
var expires = ‘‘;
if (options.expires && (typeof options.expires == ‘number‘ || options.expires.toUTCString)) {
var date;
if (typeof options.expires == ‘number‘) {
date = new Date();
date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
} else {
date = options.expires;
}
expires = ‘; expires=‘ + date.toUTCString(); // use expires attribute, max-age is not supported by IE
}
var path = options.path ? ‘; path=‘ + options.path : ‘‘;
var domain = options.domain ? ‘; domain=‘ + options.domain : ‘‘;
var secure = options.secure ? ‘; secure‘ : ‘‘;
document.cookie = [name, ‘=‘, encodeURIComponent(value), expires, path, domain, secure].join(‘‘);
} else { // only name given, get cookie
var cookieValue = null;
if (document.cookie && document.cookie != ‘‘) {
var cookies = document.cookie.split(‘;‘);
for (var i = 0; i < cookies.length; i++) {
var cookie = jQuery.trim(cookies[i]);
// Does this cookie string begin with the name we want?
if (cookie.substring(0, name.length + 1) == (name + ‘=‘)) {
cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
break;
}
}
}
return cookieValue;
}
};
然后开始在页面写操作cookie存储用户信息js函数(方法)，保存时间为两年，例子如下：
// 写入cookie
function writeHistoryCookie() {
var formatJson = {"data":[]};
var jsonCookie = {"screen_name":escape(screen_name),"screen_ico":escape(screen_ico),"screen_location":escape(screen_location),
"screen_score":escape(screen_score),"userid":escape(userid)};
// parameters value is null? string return
if(!jsonCookie.userid){
showHistory();
return;
}
//read all history
var objs = $j.cookie(‘historyCooike‘);
var arrayCookies = [];
var jsonObjs = null;
if(objs != null){
// 值得注意的是，json转字符串和字符串转json的使用方法一定要清楚并检测是否兼容浏览器
jsonObjs = jQuery.parseJSON(objs);
for(var i=0;i<jsonObjs.data.length;i++){
var js_name = unescape(jsonObjs.data[i].screen_name);
var js_ico = unescape(jsonObjs.data[i].screen_ico);
var js_id = unescape(jsonObjs.data[i].userid);
var js_location = unescape(jsonObjs.data[i].screen_location);
var js_score = unescape(jsonObjs.data[i].screen_score);
if(userid != js_id){
var temp = {"screen_name":escape(js_name),"screen_ico":escape(js_ico),"screen_location":escape(js_location),
"screen_score":escape(js_score),"userid":escape(js_id)};
formatJson.data.push(temp);
}
}
}
if(formatJson.data.length > 9){
formatJson.data.pop();//delete last one
}
//put to first
formatJson.data.unshift(jsonCookie);
//get string type json
jsonObjs = JSON.stringify(formatJson);
//writer
$j.cookie(‘historyCooike‘, jsonObjs , {expires: 365 * 2, path: ‘/‘});
//writer over show
showHistory();
}
// 读取cookie
function showHistory() {
var str=‘‘;
var historyCooike = $j.cookie(‘historyCooike‘);
var cookieObjs = null;
if(historyCooike != null){
cookieObjs = jQuery.parseJSON(historyCooike);
for(var i=0;i<cookieObjs.data.length;i++){
var cookie_name = unescape(cookieObjs.data[i].screen_name);
var cookie_ico = unescape(cookieObjs.data[i].screen_ico);
var cookie_id = unescape(cookieObjs.data[i].userid);
var cookie_location = unescape(cookieObjs.data[i].screen_location);
var cookie_score = unescape(cookieObjs.data[i].screen_score);
if(cookie_id == null || cookie_id == ‘undefined‘) continue;
str += ‘<li>‘ +
‘<div class="imgPL">‘ +
‘<a class="blue" href="profile.do?uid=‘ + cookie_id + ‘">‘ +
‘<img border="0" src="‘ + cookie_ico + ‘">‘ +
‘</a>‘ +
‘</div>‘ +
‘<p>‘ +
‘<span><a href="profile.do?uid=‘ + cookie_id + ‘">‘ + cookie_name + ‘</a></span> [‘ + cookie_location + ‘]‘+
‘<br />‘+
‘微博价值：<em class="red">‘ + cookie_score + ‘</em>‘+
‘</p>‘+
‘</li>‘
}
}
if(str == ‘‘) {
$j(‘#right_user_list‘).html(‘<li style="text-align:center; line-height:40px; color:#646464; font-size:12px; border:none; padding-bottom:0px;">暂无查询记录</li>‘);
}else{
str += ‘<div style=" text-align: right; color:#0691C4; cursor:pointer; padding-top: 7px; font-size: 12px; padding-right:10px;"><span id="clearJL" onclick="clearCookie()">清空记录>>></span></div>‘;
$j(‘#right_user_list‘).html(str);
}
}
// 清除cookie
function clearCookie(){
$j.cookie(‘historyCooike‘, null);
showHistory();
}