链接

参考

<!DOCTYPE html>
<html>
    <head>
        <meta charset=utf-8>
    </head>
    <body>
    	
        <script type="text/javascript">
            const _symbolKey = array => {
                // 补全代码
                let res = {};
                array.forEach(i => {
                    res[Symbol(i)] = i;
                })
                return res;
            }

            console.log(_symbolKey([1,2,3,4]))
        </script>
    </body>
</html>