html js设置cookie

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html cookie的获取和设置
 <script>        //进入页面时判断浏览器某个cookie是否存在        window.onload = function init() {            var phone = getCookie("phone");            if (phone != "" && phone != null) {                document.getElementById("report").style.display = "block";                document.getElementById("select").style.display = "none";            }            else {                document.getElementById("report").style.display = "none";                document.getElementById("select").style.display = "block";            }        }        //根据cookiename获取cookie值        function getCookie(c_name) {            if (document.cookie.length > 0) {                c_start = document.cookie.indexOf(c_name + "=")                if (c_start != -1) {                    c_start = c_start + c_name.length + 1                    c_end = document.cookie.indexOf(";", c_start)                    if (c_end == -1) c_end = document.cookie.length                    return unescape(document.cookie.substring(c_start, c_end))                }            }            return ""        }        //设置cookie的名称、值、有效期        function setCookie(c_name, value, expiredays) {            var exdate = new Date()            exdate.setDate(exdate.getDate() + expiredays)            document.cookie = c_name + "=" + escape(value) +            ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString())        }    </script>
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