如何使用javascript / jquery从数组中获取最大和最小日期？

Question

我想从json数组中获取最小和最大日期：

我的代码

$.getJSON(url, function (data) {
    var dates = Object.keys( data['data']['horodate'] ).map(function ( key ) {
        return data['data']['horodate'][key].replace(/\-/g,'/' ) 
    });
    var min = new Date(Math.min.apply( null, dates ));
    var max =  new Date(Math.max.apply( null, dates));
});

data数组是：

Array [ 
    "2016/10/13 00:00:00", 
    "2016/10/13 00:30:00", 
    "2016/10/13 01:00:00", 
    "2016/10/13 01:30:00", 
    "2016/10/13 02:00:00", 
    "2016/10/13 02:30:00", 
    "2016/10/13 03:00:00", 
    "2016/10/13 03:30:00", 
    "2016/10/13 04:00:00", 
    "2016/10/13 04:30:00"
]

但我有一个错误： Invalid date 。 你能帮助我吗 ？

Answer 1

将Array#sort与自定义排序功能一起使用，并获取last（max）和first（min）值。

 data = ["2016/10/13 00:00:00", "2016/10/13 00:30:00", "2016/10/13 01:00:00", "2016/10/13 01:30:00", "2016/10/13 02:00:00", "2016/10/13 02:30:00", "2016/10/13 03:00:00", "2016/10/13 03:30:00", "2016/10/13 04:00:00", "2016/10/13 04:30:00"]; var sorted = data.slice() // copy the array for keeping original array with order // sort by parsing them to date .sort(function(a, b) { return new Date(a) - new Date(b); }); // get the first and last values console.log( 'max :', sorted.pop(), 'min :', sorted.shift() ); 

---

或使用简单的Array#forEach循环。

 data = ["2016/10/13 00:00:00", "2016/10/13 00:30:00", "2016/10/13 01:00:00", "2016/10/13 01:30:00", "2016/10/13 02:00:00", "2016/10/13 02:30:00", "2016/10/13 03:00:00", "2016/10/13 03:30:00", "2016/10/13 04:00:00", "2016/10/13 04:30:00"]; // initially set max and min as first element var max = data[0], min = data[0]; // iterate over array values and update min & max data.forEach(function(v) { max = new Date(v) > new Date(max)? v: max; min = new Date(v) < new Date(min)? v: min; }); console.log('max :', max, 'min :', min); 

Answer 2

IMO，您应该使用新的Date（value）

您的代码中似乎没有什么错。

获取Invalid date的原因是您没有将date转换为Date对象，而是需要通过new Date()在JavaScript date中将其转换。

Date对象使您可以处理日期（年，月，日，小时，分钟，秒和毫秒）

var datesNew=["2016/10/13 00:00:00", "2016/10/13 00:30:00", "2016/10/13 01:00:00", "2016/10/13 01:30:00", "2016/10/13 02:00:00", "2016/10/13 02:30:00", "2016/10/13 03:00:00", "2016/10/13 03:30:00", "2016/10/13 04:00:00", "2016/10/13 04:30:00"];
//This will convert your date into Date object
$.each(datesNew, function(key, value){
    dates.push(new Date(value));
});
var min = dates.reduce(function (a, b) { return a < b ? a : b; }); 
var max = dates.reduce(function (a, b) { return a > b ? a : b; }); 

 var datesNew=["2016/10/13 00:00:00", "2016/10/13 00:30:00", "2016/10/13 01:00:00", "2016/10/13 01:30:00", "2016/10/13 02:00:00", "2016/10/13 02:30:00", "2016/10/13 03:00:00", "2016/10/13 03:30:00", "2016/10/13 04:00:00", "2016/10/13 04:30:00"]; var dates=[]; $.each(datesNew, function(key, value){ //Conver date in Date object dates.push(new Date(value)); }); var min = new Date(Math.min.apply( null, dates)); var max = new Date(Math.max.apply( null, dates)); //var min = dates.reduce(function (a, b) { return a < b ? a : b; }); //var max = dates.reduce(function (a, b) { return a > b ? a : b; }); console.log(new Date(min).toString()); console.log(new Date(max).toString()); 

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