javascript 在循环中添加分钟

Question

无法弄清楚这一点，从 9:00 到 10:00 一切都是正确的，但随后一切都变得困惑。 10:00 后跳到 11:15，然后跳到 12:30

我只是在日期/时间中添加分钟，以 15 分钟为间隔递增数组，我最多只能添加 60 分钟吗？？

function pad(val,max) { 
        var str = val.toString(); 
        return str.length < max ? pad("0" + str, max) : str;
}

function cboHrs(){
    var now = new Date(); 
    now.setHours(9);
    var hrs = [];
    for (var i=1;i<36;i++){
        var hr = {}; 
        now.setMinutes(i*15);
        hr.txt = pad(now.getHours(),2) +':'+pad(now.getMinutes(),2);
        hr.val = hr.txt; 
        hrs.push(hr);
        }
    return hrs;
}
console.log(cboHrs());

Answer 1

安东尼在我之前解决了实际问题......

After the 5th iteration, you are setting the minutes to become 75 (ie, 5 * 15 = 75) which is an 1 hour and 15 minutes which is why the next value after 10:00 becomes 11:15 - Anthony Forloney

此代码应该可以正确设置时间。

function cboHrs(){
    var now = new Date(); 
    var hrs = [];
    for (var i=1;i<36;i++){
        var hr = {};
        // add another hour every 4th iteration
        now.setHours(9 + parseInt(i / 4));
        // add 15 minutes every iteration, starting back at 0 on the 4th
        now.setMinutes((i % 4) * 15);
        hr.txt = pad(now.getHours(),2) +':'+pad(now.getMinutes(),2);
        hr.val = hr.txt; 
        hrs.push(hr);
        }
    return hrs;
}