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：

     
 //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);