cookie-小总结吧

写入common.js文件，其他页面调用即可：

//添加cookie值
function addcookie(name, value, days) {
    days = days || 0;
    var expires = "";
    if (days != 0)
        var date = new Date();
        date.setTime(date.getTime() + (days * 24 * 3600 * 1000));
        expires = "; expires=" + date.toGMTString();
    }
    document.cookie = name + "=" + escape(value) + expires + "; path=/";
}

//获取cookie值
function getcookie(name) {
    var strcookie = document.cookie;
    var arrcookie = strcookie.split("; ");
    for (var i = 0; i < arrcookie.length; i++) {
        var arr = arrcookie[i].split("=");
        if (arr[0] == name)
            return arr[1];
    }
    return "";
}

//删除cookie值
function delCookie(name) {
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval = getcookie(name);
    if (cval != null)
        document.cookie = name + "=" + cval + "; path=/;expires=" + exp.toGMTString();
}

例子：

<div id="cookie"></div>

//添加一个名为name的cookie值
addcookie("name","123456456");

//获取一个名为name的cookie值
var name = getcookie("name");

//获取页面id名为cookie的标签
var text = document.getElementById("cookie");
//将页面id名为cookie的标签的innerHTML的内容改为name所对应的值
text.innerHTML=name;

//延时五秒后 删除一个名为name的cookie值
setTimeout(function(){
    delCookie("name");
},5000);