js中加密及设置cookie

1、设置cookie及有效期时长

//cname:cookie的名称，cvalue：cookie的内容，exdays:cookie有效期时长；
function setCookie(cname, cvalue, exdays) {
    var d = new Date();
//    d.setTime(d.getTime() + (exdays*1000));//设置过期时间是多少天后；
//    d.setTime(d.getTime() + (exdays*60*60*1000));//设置过期时间是多少小时；
    d.setTime(d.getTime() + (exdays*60*60*1000));//设置过期时间是多少小时；
    var expires = "expires="+d.toUTCString();

    document.cookie = cname + "=" + cvalue + "; " + expires;
}
//获取cookie;
function getCookie(cname) {
    var name = cname + "=";
    var ca = document.cookie.split(';');
    for(var i=0; i<ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1);
        if (c.indexOf(name) != -1) return c.substring(name.length, c.length);
    }
    return null;
}
//清除cookie;
function clearCookie(name) {
    setCookie(name, "", -1);
}

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