function randomTest() {
    var result = fullClose(0, 1.5);
    console.log("随机数：" + Math.round(result * 100) / 100);
}

function fullClose(n, m) {
    var result = Math.random() * (m + 1 - n) + n;
    while (result > m) {
        result = Math.random() * (m + 1 - n) + n;
    }
    return result;
}

JS随机数某个范围的浮点