lovecoding
/
W0407


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        /**
         * cookie:
         *  大小：4KB
         *  会随着请求发到服务器
         *  过期时间必须手动设置 否则浏览器关闭则小时
         *  存储格式必须是字符串
         *  不能直接存对象
        */
        document.cookie = 'name = aa';
        let data = new Date();
        data.setDate(data.getDate() + 2);
        document.cookie = 'news = 你好;expires=' + data.toUTCString();
        function setCookie(cName, cValue, cTime) {
            let data = new Date();
            data.setDate(data.getDate() + cTime);
            document.cookie = cName + '=' + cValue + ';expires=' + data.toUTCString();
        }
        setCookie('a', 1, 30);
        function delCookie(cName) {
             let data = new Date();
             data.setDate(data.getDate() - 1);
            document.cookie = cName + '=null;expires=' + data.toUTCString();
        }
        delCookie("news");
        function getCookie(cName) {
            let cookie = document.cookie;
            let arr = cookie.split(';');
            for(let i=0;i<arr.length;i++) {
                let item = arr[i].split('=');
                if(item[0].trim() === cName) {
                    return item[1];
                }
            }
        }
        console.log(getCookie("a"));
    </script>
</body>

</html>