向这个 javascript 倒计时脚本添加前导零？

Question

我正在使用以下倒计时脚本，效果很好，但我不知道如何为数字添加前导零（例如，它显示 09 而不是 9。）有人可以帮我吗？这是当前的脚本：

function countDown(id, end, cur){
        this.container = document.getElementById(id);
        this.endDate = new Date(end);
        this.curDate = new Date(cur);


var context = this;

var formatResults = function(day, hour, minute, second){
    var displayString = [
                '<div class="stat statBig">',day,'</div>',
                '<div class="stat statBig">',hour,'</div>',
                '<div class="stat statBig">',minute,'</div>',
                '<div class="stat statBig">',second,'</div>'
    ];
    return displayString.join("");
}

var update = function(){
    context.curDate.setSeconds(context.curDate.getSeconds()+1);

    var timediff = (context.endDate-context.curDate)/1000; 

    // Check if timer expired:
    if (timediff<0){ 
        return context.container.innerHTML = formatResults(0,0,0,0);
    }

    var oneMinute=60; //minute unit in seconds
    var oneHour=60*60; //hour unit in seconds
    var oneDay=60*60*24; //day unit in seconds

    var dayfield=Math.floor(timediff/oneDay);
    var hourfield=Math.floor((timediff-dayfield*oneDay)/oneHour);
    var minutefield=Math.floor((timediff-dayfield*oneDay-hourfield*oneHour)/oneMinute);
    var secondfield=Math.floor((timediff-dayfield*oneDay-hourfield*oneHour-minutefield*oneMinute));

    context.container.innerHTML = formatResults(dayfield, hourfield, minutefield, secondfield);

    // Call recursively
    setTimeout(update, 1000);
};

// Call the recursive loop
update();
}

Answer 1

您只需要检查变量是否小于 10 并将它们添加到前导零。请尝试以下操作：

function countDown(id, end, cur){
        this.container = document.getElementById(id);
        this.endDate = new Date(end);
        this.curDate = new Date(cur);


var context = this;

var formatResults = function(day, hour, minute, second){
    day = (day < 10) ? "0"+day : day;
    hour = (hour < 10) ? "0"+hour : hour;
    minute = (minute < 10) ? "0"+minute : minute;
    second = (second < 10) ? "0"+second: second; 
    var displayString = [
                '<div class="stat statBig">',day,'</div>',
                '<div class="stat statBig">',hour,'</div>',
                '<div class="stat statBig">',minute,'</div>',
                '<div class="stat statBig">',second,'</div>'
    ];
    return displayString.join("");
}

var update = function(){
    context.curDate.setSeconds(context.curDate.getSeconds()+1);

    var timediff = (context.endDate-context.curDate)/1000; 

    // Check if timer expired:
    if (timediff<0){ 
        return context.container.innerHTML = formatResults(0,0,0,0);
    }

    var oneMinute=60; //minute unit in seconds
    var oneHour=60*60; //hour unit in seconds
    var oneDay=60*60*24; //day unit in seconds

    var dayfield=Math.floor(timediff/oneDay);
    var hourfield=Math.floor((timediff-dayfield*oneDay)/oneHour);
    var minutefield=Math.floor((timediff-dayfield*oneDay-hourfield*oneHour)/oneMinute);
    var secondfield=Math.floor((timediff-dayfield*oneDay-hourfield*oneHour-minutefield*oneMinute));

    context.container.innerHTML = formatResults(dayfield, hourfield, minutefield, secondfield);

    // Call recursively
    setTimeout(update, 1000);
};

// Call the recursive loop
update();
}

更新：

您还可以使用@Alnitak 解决方案并用函数包装它，效果相同，您将集中您的逻辑：

function countDown(id, end, cur){
        this.container = document.getElementById(id);
        this.endDate = new Date(end);
        this.curDate = new Date(cur);


var context = this;

var addLeadingZeros = function(number){
    return (number < 10) ? "0"+number : number;
}

var formatResults = function(day, hour, minute, second){
    day = addLeadingZeros(day);
    hour = addLeadingZeros(hour);
    minute = addLeadingZeros(minute);
    second = addLeadingZeros(second); 
    var displayString = [
                '<div class="stat statBig">',day,'</div>',
                '<div class="stat statBig">',hour,'</div>',
                '<div class="stat statBig">',minute,'</div>',
                '<div class="stat statBig">',second,'</div>'
    ];
    return displayString.join("");
}

var update = function(){
    context.curDate.setSeconds(context.curDate.getSeconds()+1);

    var timediff = (context.endDate-context.curDate)/1000; 

    // Check if timer expired:
    if (timediff<0){ 
        return context.container.innerHTML = formatResults(0,0,0,0);
    }

    var oneMinute=60; //minute unit in seconds
    var oneHour=60*60; //hour unit in seconds
    var oneDay=60*60*24; //day unit in seconds

    var dayfield=Math.floor(timediff/oneDay);
    var hourfield=Math.floor((timediff-dayfield*oneDay)/oneHour);
    var minutefield=Math.floor((timediff-dayfield*oneDay-hourfield*oneHour)/oneMinute);
    var secondfield=Math.floor((timediff-dayfield*oneDay-hourfield*oneHour-minutefield*oneMinute));

    context.container.innerHTML = formatResults(dayfield, hourfield, minutefield, secondfield);

    // Call recursively
    setTimeout(update, 1000);
};

// Call the recursive loop
update();
}