小编Eri*_*cel的帖子

以下是json示例:

{
   "html_attributions" : [],
   "results" : [
      {
         "geometry" : {
            "location" : {
               "lat" : -33.86755700000001,
               "lng" : 151.201527
            },
            "viewport" : {
               "northeast" : {
                  "lat" : -33.86752310000001,
                  "lng" : 151.2020721
               },
               "southwest" : {
                  "lat" : -33.8675683,
                  "lng" : 151.2013453
               }
            }
         },
         "icon" : "https://maps.gstatic.com/mapfiles/place_api/icons/generic_business-71.png",
         "id" : "ce4ffe228ab7ad49bb050defe68b3d28cc879c4a",
         "name" : "Sydney Showboats",
         "opening_hours" : {
            "open_now" : true,
            "weekday_text" : []
         },
         "photos" : [
            {
               "height" : 750,
               "html_attributions" : [
                  "\u003ca href=\"https://maps.google.com/maps/contrib/107415973755376511005/photos\"\u003eSydney Showboats\u003c/a\u003e" …

我试图在一些倒计时之后导航.这是我的代码

 constructor(
     private router: Router
    ) {}


onsubmit(){
        //I call the count down function here
        this.countdown();
      }

countDown() {
        var i = 5;
         var myinterval = setInterval(function() {
            document.getElementById("countdown").innerHTML = "redirecting in: " + i;
            if (i === 0) {
                clearInterval(myinterval );
                 this.router.navigate(['/About']);
            }
            else {
                i--;
            }
        }, 1000);
     }

倒计时显示正常,但当它到达导航部分时,我收到此错误:

EXCEPTION: Cannot read property 'navigate' of undefined

它做错了什么？