您可以尝试类似这样的方法使其更具动态性。

function getRange(num) {
    if (num <= 0) {
        return 'Invalid input';
    }
    let rangeSize = 30;
    let range = Math.floor(num/rangeSize)+1;
    return range;
}

• • 演示**

function getRange(num) {
    if (num <= 0) {
        return 'Invalid input';
    }
    let rangeSize = 30;
    let range = Math.floor(num/rangeSize)+1;
    return range;
}

console.log(getRange(29))
console.log(getRange(30))
console.log(getRange(59))
console.log(getRange(62))