nodejs 如何操作字节在内存中的位置问题 BE LE

上代码

function testNumber() {
        var arr = new Int32Array(1);
        arr[0] = 1234;
        var buf1 = Buffer.from(arr);
        var buf2 = Buffer.from(arr.buffer,'hex');
        console.log("buf1:", buf1);
        console.log("buf2:", buf2);
        buf2.writeInt32BE(1234);
        console.log("buf3:", buf2);
        buf2.writeUInt32LE(1234);
        console.log("buf3:", buf2);
    };
    testNumber();