javascript - IE 互換モードで定義されていない JSON オブジェクト

Question

<script type="text/javascript">
    function initialize() {
        var markers = JSON.parse('[{"title":"Chennai","lat":"12.897400","lng":"80.288000","Description":"welcome to chennai"},{"title":"Hyderabad","lat":"17.266700","lng":"78.530200","Description":"welcome to hyderabad"},{"title":"Banglore","lat":"12.897400","lng":"77.519500","Description":"welcome to Banglore"},{"title":"vishkapatnam","lat":"17.518300","lng":"83.320300","Description":"welcome to Vishkapatnam"}]');
        var mapOptions = {
            center: new google.maps.LatLng(markers[0].lat, markers[0].lng),
            zoom: 5,
            mapTypeId: google.maps.MapTypeId.ROADMAP

        };

JSON が Microsoft に見つかりません。どうすればよいですか?