<input type="file" id="MapUploadTd" onchange="getMapPictureSize(this.files[0])"/>

 var mapPictureSize = [];

 function getMapPictureSize(file) {

     var reader = new FileReader;

     reader.onload = function (evt) {

         var image = new Image();

         image.onload = function () {

             mapPictureSize[0] = this.width + "";

             mapPictureSize[1] = this.height + "";

             console.log(mapPictureSize);

         };

         image.src = evt.target.result;

     };

     reader.readAsDataURL(file);

 }