js常用获取指定cookies方法

一般关于js读取cookie方法有很多，下面的实例函数主要是利用split函数来分切，和document.cookie获取所有cookie再利用for遍历所有数组，判断如果cookie名相同，那么这个cookie 就是我们要找的。

方法一

代码如下:

var acookie = document.cookie.split("; ");

function getck(sname) {//获取单个cookies
    for (var i = 0; i < acookie.length; i++) {
        var arr = acookie[i].split("=");
        if (sname == arr[0]) {
            if (arr.length > 1)
                return unescape(arr[1]);
            else
                return "";
        }
    }
    return "";
}

方法二

代码如下:

function getcookie(objname) {//获取指定名称的cookie的值
    var arrstr = document.cookie.split("; ");
    for (var i = 0; i < arrstr.length; i++) {
        var temp = arrstr[i].split("=");
        if (temp[0] == objname) return unescape(temp[1]);
    }
}方法三

代码如下:

function getcookie(cookiename) {
    var cookiestring = document.cookie;
    var start = cookiestring.indexOf(cookiename + '= ');
    if (start == -1)  //  找不到
        return null;
    start += cookiename.length + 1;
    var end = cookiestring.indexOf("; ", start);
    if (end == -1) return unescape(cookiestring.substring(start));
    return unescape(cookiestring.substring(start, end));
}

方法四

代码如下:

function readcookie(name) {
    var cookievalue = "";
    var search = name + "=";
    if (document.cookie.length > 0) {
        offset = document.cookie.indexOf(search);
        if (offset != -1) {
            offset += search.length;
            end = document.cookie.indexOf(";", offset);
            if (end == -1) end = document.cookie.length;
            cookievalue = unescape(document.cookie.substring(offset, end))
        }
    }
    return cookievalue;
}