我如何按日期排序此数组(ISO 8601)?
var myArray = new Array();
myArray[0] = { name:'oldest', date:'2007-01-17T08:00:00Z' }
myArray[1] = { name:'newest', date:'2011-01-28T08:00:00Z' }
myArray[2] = { name:'old', date:'2009-11-25T08:00:00Z' }
游乐场:
http://jsfiddle.net/4tUZt/
提前致谢!
答案 0 :(得分:26)
正如@kdbanman所指出的那样,ISO8601 参见一般原则 是专为字典排序而设计的。因此,ISO8601字符串表示可以像任何其他字符串一样进行排序,这将给出预期的顺序。
'2007-01-17T08:00:00Z' < '2008-01-17T08:00:00Z' === true
所以你要实现:
var myArray = [
{ name:'oldest', date:'2007-01-17T08:00:00Z' },
{ name:'newest', date:'2011-01-28T08:00:00Z' },
{ name:'old', date:'2009-11-25T08:00:00Z' }
];
myArray.sort(function(a, b) {
return (a.date < b.date) ? -1 : ((a.date > b.date) ? 1 : 0);
});
较旧版本的WebKit和Internet Explorer不支持ISO 8601日期,因此您必须创建兼容日期。它受FireFox和现代WebKit支持有关Date.parse支持的更多信息,请参阅此处JavaScript: Which browsers support parsing of ISO-8601 Date String with Date.parse
这是一篇非常好的文章,用于创建Javascript ISO 8601兼容日期,然后您可以按照常规javascript日期进行排序。
http://webcloud.se/log/JavaScript-and-ISO-8601/
Date.prototype.setISO8601 = function (string) {
var regexp = "([0-9]{4})(-([0-9]{2})(-([0-9]{2})" +
"(T([0-9]{2}):([0-9]{2})(:([0-9]{2})(\.([0-9]+))?)?" +
"(Z|(([-+])([0-9]{2}):([0-9]{2})))?)?)?)?";
var d = string.match(new RegExp(regexp));
var offset = 0;
var date = new Date(d[1], 0, 1);
if (d[3]) { date.setMonth(d[3] - 1); }
if (d[5]) { date.setDate(d[5]); }
if (d[7]) { date.setHours(d[7]); }
if (d[8]) { date.setMinutes(d[8]); }
if (d[10]) { date.setSeconds(d[10]); }
if (d[12]) { date.setMilliseconds(Number("0." + d[12]) * 1000); }
if (d[14]) {
offset = (Number(d[16]) * 60) + Number(d[17]);
offset *= ((d[15] == '-') ? 1 : -1);
}
offset -= date.getTimezoneOffset();
time = (Number(date) + (offset * 60 * 1000));
this.setTime(Number(time));
}
用法:
console.log(myArray.sort(sortByDate));
function sortByDate( obj1, obj2 ) {
var date1 = (new Date()).setISO8601(obj1.date);
var date2 = (new Date()).setISO8601(obj2.date);
return date2 > date1 ? 1 : -1;
}
更新了用法以包括排序技术信用@nbrooks
答案 1 :(得分:3)
我会这样做:
console.clear();
var myArray = new Array();
myArray[0] = { name:'oldest', date:'2007-01-17T08:00:00Z' }
myArray[1] = { name:'newest', date:'2011-01-28T08:00:00Z' }
myArray[2] = { name:'old', date:'2009-11-25T08:00:00Z' }
console.dir(myArray);
var newArray = myArray.sort(function(a,b){
if (a.date < b.date) return -1;
else if (a.date > b.date) return 1;
else return 0;
});
console.dir(newArray);
答案 2 :(得分:2)
$(document).ready(function()
{
var myArray = [ { name:'oldest', date:'2007-01-17T08:00:00Z' },
{ name:'newest', date:'2011-01-28T08:00:00Z' },
{ name:'old', date:'2009-11-25T08:00:00Z' }];
console.log( myArray.sort(sortByDate) );
});
// Stable, ascending sort (use < for descending)
function sortByDate( obj1, obj2 ) {
return new Date(obj2.date) > new Date(obj1.date) ? 1 : -1;
}
答案 3 :(得分:2)
通过使用内置的词典比较功能String.prototype.localeCompare而不是?:
复合运算符或其他表达式,可以避免创建日期:
var myArray = [
{name: 'oldest', date: '2007-01-17T08:00:00Z'},
{name: 'newest', date: '2011-01-28T08:00:00Z'},
{name: 'old', date: '2009-11-25T08:00:00Z'}
];
// Oldest first
console.log(
myArray.sort((a, b) => a.date.localeCompare(b.date))
);
// Newest first
console.log(
myArray.sort((a, b) => -a.date.localeCompare(b.date))
);
答案 4 :(得分:1)
演示:http://jsfiddle.net/4tUZt/4/
var myArray = new Array();
myArray[0] = { name:'oldest', date: '2007-01-17T08:00:00Z' };
myArray[1] = { name:'newest', date: '2011-01-28T08:00:00Z' };
myArray[2] = { name:'old', date: '2009-11-25T08:00:00Z' };
var sortFunction = function (a, b) {
return Date.parse(b.date) - Date.parse(a.date);
};
/* or
var sortFunction = function (a, b) {
return new Date(b.date) - new Date(a.date);
};
*/
console.log(myArray.sort(sortFunction));
答案 5 :(得分:1)
ISO8601旨在正确排序为纯文本,因此通常情况下会进行正常排序。
要按数组中对象的特定键进行排序,需要为sort()
方法指定比较函数。在许多其他语言中,使用cmp
函数很容易编写,但JS没有内置cmp
函数,因此我发现编写自己的函数最简单。
var myArray = new Array();
myArray[0] = { name:'oldest', date:'2007-01-17T08:00:00Z' }
myArray[1] = { name:'newest', date:'2011-01-28T08:00:00Z' }
myArray[2] = { name:'old', date:'2009-11-25T08:00:00Z' }
// cmp helper function - built in to many other languages
var cmp = function (a, b) {
return (a > b) ? 1 : ( (a > b) ? -1 : 0 );
}
myArray.sort(function (a,b) { return cmp(a.date, b.date) });
P.S。我会使用类似JSON的语法编写我的数组,如下所示:
var myArray = [
{ name:'oldest', date:'2007-01-17T08:00:00Z' },
{ name:'newest', date:'2011-01-28T08:00:00Z' },
{ name:'old', date:'2009-11-25T08:00:00Z' }
];
答案 6 :(得分:0)
请注意,现在接受的答案建议按字典顺序对我们的日期进行排序。
但是,仅当您所有的字符串都使用“ Z”或“ +00”时区时,此功能才起作用(= UTC)。 以'Z'结尾的日期字符串确实符合ISO8601标准,但是所有ISO8601都不以'Z'结尾。
因此,要完全符合ISO8601,您需要使用某些日期库(例如Javascript Date或Moment.js)解析字符串,然后比较这些对象。 对于这一部分,您可以检查Scott的答案,该答案还涵盖了与ISO8601不兼容的浏览器。
我的Javascript Date简单示例(可在任何不太旧的浏览器上使用):
var myArray = [
{ name:'oldest', date:'2007-01-17T08:00:00Z' },
{ name:'newest', date:'2011-01-28T08:00:00+0100' },
{ name:'old', date:'2009-11-25T08:00:00-0100' }
];
myArray.sort(function(a, b) {
return new Date(a.date) - new Date(b.date);
});
缺点:这比按字典顺序比较字符串要慢。
有关ISO8601标准的更多信息:here。