Kann nicht Eigentum von undefinierter Javascript

Question

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    { dateTime: '2016-03-30 05:55:55', value: '17.0' }, 
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    { dateTime: '2016-03-30 06:05:51', value: '2.0' }, 
    { dateTime: '2016-03-30 06:05:53', value: '2.0' } ] 

der obige Wert ist in Variable console.log (points.points [tags [0]]) lesen, wenn ich console.log (points.points [tags [0 drucken] ] [0]) es gibt mir Daten wie diese {Datum: '2016-03-30 06:05:53', Wert: '2.0'}

aber wenn ich versuche, die Daten zu drucken console.log (Punkte .points [Tags [0]] [0] .dateTime) es gibt mir einen Fehler. Kann nicht Eigentum 'Datums- und Uhrzeit' undefinierter kann nicht lesen Eigenschaft 'Wert' undefined

var data = []; 
     <% 
     for (var i=0; i < tags.length; i++) 
     { %> 
     var dataSeries = { type: "line" }; 
     var dataPoints = []; 

      // var pointdata ="<%= points.points[tags[i]] %>"; 


     for (var n=0; n < <%= points.points[tags[i]].length %>; n++) 
     { 

      <%= console.log(points.points[tags[i]]); %> 

      dataPoints.push({ 

       x: <%= points.points[tags[i]][n].dateTime %>, 
       y: <%= points.points[tags[i]][n].value %> 
      }); 
     } 
      dataSeries.dataPoints = dataPoints; 
      data.push(dataSeries);    
      <% } %> 

    </script> 

Answer 1

Versuchen

points.points[tags[0]][0]["dateTime"] 

, da es ein Wörterbuch ist lesen.