momentjs：diff函數不能正常工作

Question

我正在比較date和angularjs的幫助。

 curdate = moment(); 
     curdate = curdate.format('DD-MM-YYYY'); 
lastseen = moment(data.last_seen); //this data is coming from database (DD-MM-YYYY) 

lastseen = lastseen.isValid(); 
duration = lastseen.diff(curdate, 'days') ; 
alert(lastseen); // it is returning false. 

alert(duration); 

在螢火蟲我得到以下錯誤。

錯誤：lastseen.diff不是一個函數

對象{_i： 「2017年9月2日」，_f：未定義，_l：未定義，_isUTC：假的，_D：無效的日期}

請告知我做錯了什麼。

謝謝

讓我知道如果你需要更多的細節。

Answer 1

你可以跳過這一行lastseen = lastseen.isValid();，因爲當你這樣做時，最後看到的是一個布爾值，即真或假。這個數值不具有功能diff.

curdate = moment(); 
 
// skip this like.. use moment object 
 
     // curdate = curdate.format('DD-MM-YYYY'); 
 
lastseen = moment("24-02-2017",'DD-MM-YYYY'); //this data is coming from database (DD-MM-YYYY) 
 
//skip this also 
 
//lastseen = lastseen.isValid(); 
 
duration = lastseen.diff(curdate, 'days') ; 
 
alert(lastseen); // it is returning false. 
 

 
alert(duration);

<script src="http://momentjs.com/downloads/moment.js"></script>

Answer 2

替換此

lastseen = moment(data.last_seen); 

與

lastseen = moment(data.last_seen, "MM-DD-YYYY"); 

，不與一個布爾

更換lastseen

lastseen = lastseen.isValid(); 

Answer 3

，詳細瞭解moment.js Difference

var app = angular.module("app", []); 
 
app.controller("ctrl", function($scope) { 
 

 
var curdate = moment(); 
 
    var lastseen = moment('12-02-2017','DD-MM-YYYY'); //this data is coming from database (DD-MM-YYYY) 
 

 
    var flag = lastseen.isValid(); 
 
    var duration = curdate.diff(lastseen, 'days'); 
 
    alert(flag); // it is returning false. 
 

 
    //Adding plus to include start date, If you want to include 
 
    alert(duration+1); 
 
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.17.1/moment.js"></script> 
 
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script> 
 
<div ng-app="app" ng-controller="ctrl"> 
 
    {{resultados}} 
 
</div>