Question

在Javascript中，只要我们调用getDate（）方法，就会在该月的特定日期返回值1-31。当我在var goal中指定一个大于31的未来日期时，这会导致我的倒数计时器出现问题，导致倒数计时器输出'12'而不是实际在未来日期之前剩余的天数。

  function twoDigits(number) {return (number < 10 ? '0' : '') + number};

        var goal = "Sun January 01 2012 00:00:01";
        goal = new Date(goal);
        var now = new Date();
        var count = new Date(goal.getTime() - now.getTime());
        var day = count.getDate() -1;
        var hour = count.getHours()-1; 
        var format = twoDigits(day) + ":" + twoDigits(hour) + ":" + twoDigits(count.getMinutes()) + ":" + twoDigits(count.getSeconds());
      $(function () {
        $('#counter').countdown({
          image: 'digits.png',
          startTime: format
        });
      });

我有什么想法可以解决这个问题吗？

Answer 1

function padLeft(str,len,char) {
    len=Number(len)||1;
    char=String(char)||" ";
    for(var i=0;i<len;i++)str=char+str;
    return str.substr(str.length-len);
}

//$(document).ready(function() {
    var goal = "Sun January 01 2011 00:00:01";
    goal = new Date(goal);
    var now = new Date();
    var count = goal.getTime() - now.getTime();
    var sign = count/Math.abs(count);
    count = Math.abs(count);
    var days = Math.floor(count/(24*60*60*1000));
    count -= days*24*60*60*1000;
    var hours = Math.floor(count/(60*60*1000));
    count -= hours*60*60*1000;
    var minutes = Math.floor(count/(60*1000));
    count -= minutes*60*1000;
    var secs = Math.floor(count/1000);

    var startTime = days +":"+ padLeft(hours,2,"0") +":"+ padLeft(minutes,2,"0") +":"+ padLeft(secs,2,"0");
    alert(startTime);
    /*
    $("#counter").countdown({
        image: 'digits.png',
        startTime: startTime,
        format: "dd:hh:mm:ss"
    });
    */ 
//}

Answer 2

这不是针对您的代码问题的确切修复但是如果你想要日期的帮助方法，看看sugar.js它有很多辅助方法，比如很容易计算现在和给定日期之间的天数差异。看看the features page for all date methods

您可以使用此功能，例如：

var goal = "Sun January 01 2011 00:00:01";
goal = new Date(goal);
var difference = goal.daysFromNow();

daysFromNow()已经是daysUntil()＆amp;的别名daysSince()用于计算过去或未来的差异，daysFromNow（）会立即处理过去和未来：）

并且该变量将为您提供总天数，即使它超过31天。

Javascript getDate（）倒数计时器的方法

2 个答案: