分别选择字符

Question

我只需要选择日，月和年（单独），然后计算天数直到到期。为什么这不能正常工作？我正确使用substr吗？

http://jsfiddle.net/infatti/XeqPT/15/

function daysUntil(year, month, day) { 
    var now = new Date(), 
     dateEnd = new Date(year, month - 1, day), // months are zero-based 
     days = (dateEnd - now)/1000/60/60/24; // convert milliseconds to days 

    return Math.round(days); 
} 

$('#paging1 ul li').each(function() { 

    var monthDue = $(this).find('.due-date').text().substr(0,2); 
    var dayDue = $(this).find('.due-date').text().substr(3,2); 
    var yearDue = $(this).find('.due-date').text().substr(6,4); 

    $(this).find('.days-due').text(daysUntil(yearDue, monthDue, dayDue)); 

}); 

Answer 1

你可以试试这个：

var monthDue = $('.due-date').text().substr(0,2); 
var dayDue = $('.due-date').text().substr(3,2); 
var yearDue = $('.due-date').text().substr(6,4); 

我也建议你看看moment.js日期操纵或计算。 http://momentjs.com/docs/#/displaying/difference/

Answer 2

$(this)是不是你以为是和wasn't finding the .due-date element，试试这个方法：

/* caching the relevant text to avoid having to find the same element/text 
    multiple times: */ 
var due = $('.due-date').text(), 
    monthDue = due.substr(0,2), 
    dayDue = due.substr(3,2), 
    yearDue = due.substr(6,4); 

// to demonstrate that you're getting the relevant text 
console.log(yearDue, monthDue, dayDue); 

$('.days-due').each(function(){ 
    $(this).text(daysUntil(yearDue, monthDue, dayDue)); 
}); 

JS Fiddle demo。

Answer 3

LIVE DEMO

function daysUntil(untilDate) { 
    var Time = new Date(untilDate).getTime(); 
    var currTime = new Date().getTime(); 
    var difference = Time-currTime; 
    return Math.ceil(difference/(1000*60*60*24)); 
} 


$('.days-due').each(function() { 
    var dateUntil = $('.due-date').text(); // use something more specific 
    $(this).text(daysUntil(dateUntil)); 
});