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js如何在浏览器添加cookie（添加、获取、删除）

首先，简单用js将cookie保存到浏览器中，具体可按F12在这里查看（火狐浏览器）

1、js脚本方法

1）添加cookie方法

      //添加cookie
    var addCookie = function (name, value, time) {
        var strSec = getSec(time);
        var exp = new Date();
        exp.setTime(exp.getTime() + strSec * 1);    
        //设置cookie的名称、值、失效时间
        document.cookie = name + "=" + value + ";expires="+ exp.toGMTString();  
    }

2）获取cookie方法

    //获取cookie
    var getCookie = function (name) {
        //获取当前所有cookie
        var strCookies = document.cookie;
        //截取变成cookie数组
        var array = strCookies.split(';');
        //循环每个cookie
        for (var i = 0; i < array.length; i++) {
            //将cookie截取成两部分
            var item = array[i].split("=");
            //判断cookie的name 是否相等
            if (item[0] == name) {
                return item[1];
            }
        }
        return null;
    }

3）删除cookie方法

   //删除cookie
    var delCookie = function (name) {
        var exp = new Date();
        exp.setTime(exp.getTime() - 1);
        //获取cookie是否存在
        var value = getCookie(name);
        if (value != null) {
            document.cookie = name + "=" + value + ";expires="+ exp.toUTCString();
        }
    }

4）计算cookie毫秒方法

    //获取时间的秒数（参数：d，h,m,s） 12m
    var getSec = function(str){
        var str1 = str.substr(0, str.length - 1);  //时间数值 
        var str2 = str.substr(str.length-1, 1);    //时间单位
        if (str2 == "s") {
            return str1 * 1000;
        }
        else if (str2 == "m") {
            return str1 * 60 * 1000;
        }
        else if (str2 == "h") {
            return str1 * 60 * 60 * 1000;
        }
        else if (str2 == "d") {
            return str1 * 24 * 60 * 60 * 1000;
        }
    }

5）页面调用方法

var addCookieFun = function(){
        var cookie_key = document.getElementById("cookie_key").value;
        var cookie_val = document.getElementById("cookie_val").value;
        var cookie_time = document.getElementById("cookie_time").value;    
        addCookie(cookie_key,cookie_val,cookie_time);    
        alert("添加cookie："+ cookie_key);
    }
    
    var chkCookieFun = function(){
        var cookie_key = document.getElementById("cookie_key").value;
        var result = getCookie(cookie_key);
        if(result!=null){
            alert("存在cookie:"+ cookie_key);    
        }else{
            alert("不存在cookie:"+cookie_key);    
        }
    }
    
    var delCookieFun = function(){
        var cookie_key = document.getElementById("cookie_key").value;
        delCookie(cookie_key);
        alert("删除cookie："+ cookie_key);
    }

2、html界面如下

<body>
    <label>cookie名：</label><input id="cookie_key" type="text"  /> <br/>
    <label>cookie值：</label><input id="cookie_val" type="text"  /> <br/>
    <label>失效时间：</label><input id="cookie_time"  type="text" title="时间格式（10s,2m等）" /> <br/> <br/>
    <input type="button" value="添加cookie"  onClick ="addCookieFun()"/> &nbsp; &nbsp;
    <input type="button" value="检查cookie"  onClick ="chkCookieFun()"/>  &nbsp; &nbsp;
    <input type="button" value="删除cookie"  onClick ="delCookieFun()"/>  &nbsp; &nbsp;
</body>