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Can't set cookie in JavaScript

I am working with it for an hour but I can't figure out what is wrong in that.

<html>

<body>

    <input type="button" value="set" onclick=setcook()>
    <input type="button" value="get" onclick=getcook()>

    <script>
        function setcook() {
            document.cookie = "un=nu";
        }

        function getcook() {
            if (document.cookie.length != 0)
                alert(document.cookie);
            else {
                alert("cookie not available");
            }
        }
    </script>

</body>

</html>

使用这个方法..希望它会帮助你

Cookies.set('key',value);

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