Link

<!DOCTYPE html>
<html>
    <head>
        <meta charset=utf-8>
    </head>
    <body>
    	<p>1</p>
        <script type="text/javascript">
            const _elementKey = () => {
                // 补全代码
                let name = document.querySelector('p');
                let val = document.querySelector('p').innerText;
                let map = new Map();
                return map.set(name, val);
            }
        </script>
    </body>
</html>