在新浪微博首页看到每条微博后边显示的时间并不是标准的年-月-日格式，而是经过换算的时间差，如：发表于5分钟前、发表于 2小时前 ，比起标准的时间显示格式，貌似更加直观和人性化
要实现类似功能，用JS就可以，实现方法如下：
一、javascript函数实现:
实例1：
代码如下:
//JavaScript函数：
var minute = 1000 * 60;
var hour = minute * 60;
var day = hour * 24;
var halfamonth = day * 15;
var month = day * 30;
function getDateDiff(dateTimeStamp){
var now = new Date().getTime();
var diffValue = now - dateTimeStamp;
if(diffValue < 0){
//若日期不符则弹出窗口告之
//alert("结束日期不能小于开始日期！");
}
var monthC =diffValue/month;
var weekC =diffValue/(7*day);
var dayC =diffValue/day;
var hourC =diffValue/hour;
var minC =diffValue/minute;
if(monthC>=1){
result="发表于" + parseInt(monthC) + "个月前";
}
else if(weekC>=1){
result="发表于" + parseInt(weekC) + "周前";
}
else if(dayC>=1){
result="发表于"+ parseInt(dayC) +"天前";
}
else if(hourC>=1){
result="发表于"+ parseInt(hourC) +"个小时前";
}
else if(minC>=1){
result="发表于"+ parseInt(minC) +"分钟前";
}else
result="刚刚发表";
return result;
}
若你得到的时间格式不是时间戳，可以使用下面的JavaScript函数把字符串转换为时间戳, 本函数的功能相当于JS版的strtotime：
代码如下:
//js函数代码：字符串转换为时间戳
function getDateTimeStamp(dateStr){
return Date.parse(dateStr.replace(/-/gi,"/"));
}
实例2：
代码如下:
<script>
function jsDateDiff(publishTime){
var d_minutes,d_hours,d_days;
var timeNow = parseInt(new Date().getTime()/1000);
var d;
d = timeNow - publishTime;
d_days = parseInt(d/86400);
d_hours = parseInt(d/3600);
d_minutes = parseInt(d/60);
if(d_days>0 && d_days<4){
return d_days+"天前";
}else if(d_days<=0 && d_hours>0){
return d_hours+"小时前";
}else if(d_hours<=0 && d_minutes>0){
return d_minutes+"分钟前";
}else{
var s = new Date(publishTime*1000);
// s.getFullYear()+"年";
return (s.getMonth()+1)+"月"+s.getDate()+"日";
}
}
</script>
二、jquery插件实现
HTML代码：
代码如下:
<span class="time timeago" title="<fmt:formatDate value="${comment.createAt}" pattern="yyyy-MM-dd HH:mm:ss"/>"></span>
调用代码：
代码如下:
jQuery("span.timeago").timeago();
插件源码：
代码如下:
(function (factory) {
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define(['jquery'], factory);
} else {
// Browser globals
factory(jQuery);
}
}(function ($) {
$.timeago = function(timestamp) {
if (timestamp instanceof Date) {
return inWords(timestamp);
} else if (typeof timestamp === "string") {
return inWords($.timeago.parse(timestamp));
} else if (typeof timestamp === "number") {
return inWords(new Date(timestamp));
} else {
return inWords($.timeago.datetime(timestamp));
}
};
var $t = $.timeago;
$.extend($.timeago, {
settings: {
refreshMillis: 60000,
allowFuture: false,
localeTitle: false,
cutoff: 0,
strings: {
prefixAgo: null,
prefixFromNow: null,
suffixAgo: "前",
suffixFromNow: "from now",
seconds: "1分钟",
minute: "1分钟",
minutes: "%d分钟",
hour: "1小时",
hours: "%d小时",
day: "1天",
days: "%d天",
month: "1月",
months: "%d月",
year: "1年",
years: "%d年",
wordSeparator: "",
numbers: []
}
},
inWords: function(distanceMillis) {
var $l = this.settings.strings;
var prefix = $l.prefixAgo;
var suffix = $l.suffixAgo;
if (this.settings.allowFuture) {
if (distanceMillis < 0) {
prefix = $l.prefixFromNow;
suffix = $l.suffixFromNow;
}
}
var seconds = Math.abs(distanceMillis) / 1000;
var minutes = seconds / 60;
var hours = minutes / 60;
var days = hours / 24;
var years = days / 365;
function substitute(stringOrFunction, number) {
var string = $.isFunction(stringOrFunction) ? stringOrFunction(number, distanceMillis) : stringOrFunction;
var value = ($l.numbers && $l.numbers[number]) || number;
return string.replace(/%d/i, value);
}
var words = seconds < 45 && substitute($l.seconds, Math.round(seconds)) ||
seconds < 90 && substitute($l.minute, 1) ||
minutes < 45 && substitute($l.minutes, Math.round(minutes)) ||
minutes < 90 && substitute($l.hour, 1) ||
hours < 24 && substitute($l.hours, Math.round(hours)) ||
hours < 42 && substitute($l.day, 1) ||
days < 30 && substitute($l.days, Math.round(days)) ||
days < 45 && substitute($l.month, 1) ||
days < 365 && substitute($l.months, Math.round(days / 30)) ||
years < 1.5 && substitute($l.year, 1) ||
substitute($l.years, Math.round(years));
var separator = $l.wordSeparator || "";
if ($l.wordSeparator === undefined) { separator = " "; }
return $.trim(
},
parse: function(iso8601) {
var s = $.trim(iso8601);
s = s.replace(/\.\d+/,""); // remove milliseconds
s = s.replace(/-/,"/").replace(/-/,"/");
s = s.replace(/T/," ").replace(/Z/," UTC");
s = s.replace(/([\+\-]\d\d)\:?(\d\d)/," $1$2"); // -04:00 -> -0400
return new Date(s);
},
datetime: function(elem) {
var iso8601 = $t.isTime(elem) ? $(elem).attr("datetime") : $(elem).attr("title");
return $t.parse(iso8601);
},
isTime: function(elem) {
// jQuery's `is()` doesn't play well with HTML5 in IE
return $(elem).get(0).tagName.toLowerCase() === "time"; // $(elem).is("time");
}
});
// functions that can be called via $(el).timeago('action')
// init is default when no action is given
// functions are called with context of a single element
var functions = {
init: function(){
var refresh_el = $.proxy(refresh, this);
refresh_el();
var $s = $t.settings;
if ($s.refreshMillis > 0) {
setInterval(refresh_el, $s.refreshMillis);
}
},
update: function(time){
$(this).data('timeago', { datetime: $t.parse(time) });
refresh.apply(this);
},
updateFromDOM: function(){
$(this).data('timeago', { datetime: $t.parse( $t.isTime(this) ? $(this).attr("datetime") : $(this).attr("title") ) });
refresh.apply(this);
}
};
$.fn.timeago = function(action, options) {
var fn = action ? functions[action] : functions.init;
if(!fn){
throw new Error("Unknown function name '"+ action +"' for timeago");
}
// each over objects here and call the requested function
this.each(function(){
fn.call(this, options);
});
return this;
};
function refresh() {
var data = prepareData(this);
var $s = $t.settings;
if (!isNaN(data.datetime)) {
if ( $s.cutoff == 0 || distance(data.datetime) < $s.cutoff) {
$(this).text(inWords(data.datetime));
}
}
return this;
}
function prepareData(element) {
element = $(element);
if (!element.data("timeago")) {
element.data("timeago", { datetime: $t.datetime(element) });
var text = $.trim(element.text());
if ($t.settings.localeTitle) {
element.attr("title", element.data('timeago').datetime.toLocaleString());
} else if (text.length > 0 && !($t.isTime(element) && element.attr("title"))) {
element.attr("title", text);
}
}
return element.data("timeago");
}
function inWords(date) {
return $t.inWords(distance(date));
}
function distance(date) {
return (new Date().getTime() - date.getTime());
}
// fix for IE6 suckage
document.createElement("abbr");
document.createElement("time");
}));
