test1.html

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

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

    <script type="module">

        let bases = "{id:6}"
        // 字符串转字节

        // let temp1 = s2b(bases)
        // console.log(new Uint8Array(temp1))
        // byte转字符串
        function b2s(bytes) {
            let str = []
            for (let i in bytes) {
                str.push(String.fromCharCode(bytes[i]))
            }
            return str.join("")
        }
        function s2b(str) {
            let bytes = []
            for (let i in str) {
                bytes.push(str.charCodeAt(i) & 0xFF)
            }
            return bytes
        }

        let basedata = new Uint8Array(new ArrayBuffer(30000 / 8))
        let setData = (key, value) => {
            let index = Math.floor(key / 8)
            const dex = key % 8
            const byte = value.charCodeAt(0) & 0xFF
            console.log(byte)
            basedata[index] = byte ^ (2 ** dex)
        }
        setData(5, "2")


        // 获取 序号状态
        function getStatus(id) {
            const index = Math.floor(id / 8)
            const dex = id % 8
            const byte = basedata[index]
            return (byte & (2 ** dex))
        }
        getStatus(5)
    </script>
</body>

</html>