JS实现cookie的CRUD（需要注意path）

其实也没太大难度，主要注意设置cookie的时候需要统一path，因为现在很多pathinfo模式的url，会导致path不统一，你在 www.domain.com/foo 路径下设置的cookie在www.domain.com/bar下可能会读取不到，因为path可能不同，默认 / 最好

1//增加或者更新cookie
2function setCookie(c_name, value, expiredays, path) {
3    var expiredays = arguments[2] ? arguments[2] : 1;
4    var path = arguments[3] ? arguments[3] : '/';
5    console.log(expiredays, path);
6    var exdate = new Date();
7    exdate.setDate(exdate.getDate() + expiredays * 24 * 60 * 60 * 1000);
8    document.cookie = c_name + "=" + escape(value) +
9    ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString() + ";path=" + path);
10}
11
12//获取cookie
13function getCookie(c_name) {
14    if (document.cookie.length > 0) {
15        c_start = document.cookie.indexOf(c_name + "=");
16        if (c_start != -1) {
17            c_start = c_start + c_name.length + 1;
18            c_end = document.cookie.indexOf(";", c_start);
19            if (c_end == -1) c_end = document.cookie.length
20            return unescape(document.cookie.substring(c_start, c_end));
21        }
22    }
23    return "";
24}
25
26//删除cookie
27function delCookie(c_name, path) {
28    var path = arguments[1] ? arguments[1] : '/';
29    var exp = new Date();
30    exp.setTime(exp.getTime() - 1);
31    var cval = getCookie(c_name);
32    if (cval != null) document.cookie = c_name + "=" + cval + ";expires=" + exp.toGMTString() + ";path=" + path;
33}
34
35setCookie("name", "sallency");
36
37getCookie("name");
38
39delCookie("name");