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【Js】 cookieUtil

作者:昭君 / 发布于2016/12/21/ 539

function cookieUtil() {  
        this.getCookie = getCookie;  
        this.setCookie = setCookie;  
        this.checkCookie = checkCookie;  
        this.delCookie=delCookie;  
        this.clearCookies=clearCookies;  
        this.begin=begin;  
        function begin(){  
            alert('cookieUtil.js');  
        }  
          
        function clearCookies(){//删除所有cookies   
            var cookies = document.cookie.split(";");  
            for ( var i = 0; i < cookies.length; i++) {  
                var exp = new Date();  
                exp.setTime(exp.getTime() - 1);  
                var cookie = cookies[i];  
                var eqPos = cookie.indexOf("=");  
                var name = eqPos > -1 ? cookie.substr(0, eqPos) : cookie;  
                var domain = location.host.substr(location.host.indexOf('.'));  
                document.cookie = name  
                        + "=;expires="+ exp.toGMTString();    
            }  
        }  
          
        function delCookie(name) {//删除cookies   
            var exp = new Date();  
            exp.setTime(exp.getTime() - 1);  
            var cval = getCookie(name);  
            if (cval != null)  
                document.cookie = name + "=" + cval + ";expires="  
                        + exp.toGMTString();  
        }  
        function getCookie(c_name) {//获取cookie  
            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 ""  
        }  
  
        function setCookie(c_name, value, expiredays) {//设置cookie  
            var exdate = new Date();  
            exdate.setDate(exdate.getDate() + expiredays);  
            document.cookie = c_name  
                    + "="  
                    + escape(value)  
                    + ((expiredays == null) ? "" : ";expires="  
                            + exdate.toGMTString());  
        }  
  
        function checkCookie(name) {//检测cookie是否存在  
            var username = getCookie(name);  
            if (username != null && username != "") {  
                alert('Welcome again ' + username + '!');  
            } else {  
                username = prompt('Please enter your name:', "");  
                if (username != null && username != "") {  
                    setCookie('username', username, 365);  
                }  
            }  
        }  
    }

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