尝试生成随机数时出现问题

function generateRandom(rFrom, rTo)
{
    var num;
    num = Math.floor(rFrom + (1 + rTo - rFrom) * Math.random());

    return num;
}

function btGenerate_onClick(event)
{
    var nFrom;
    var nTo;

    nFrom = document.getElementById(\"txtFrom\").value;
    nTo = document.getElementById(\"txtTo\").value;

    document.getElementById(\"lblResult\").innerText = generateRandom(nFrom, nTo);
}

2

5

From

To

210

20

27

211

2

5

function generateRandom(rFrom, rTo)
{
    var num;
    rFrom = Number(rFrom); rTo = Number(rTo);
    num = Math.floor(rFrom + (1 + rTo - rFrom) * Math.random());

    return num;
}