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I'm assuming /camera/rgb/camera_info is of the sensor_msgs/CameraInfo type. If that's the case, storing the width and height should be possible with code like the following:

var con = new ros.Connection('ws://localhost:9090');

var width = null;
var height = null;

con.setOnOpen(function() {
  con.addHandler('/camera/rgb/camera_info',function(msg) {
    width = msg.width;
    height = msg.height;
    //do something with width and height?
    con.callService('/rosjs/unsubscribe',['/camera/rgb/camera_info'],function() {});
  });
  con.callService('/rosjs/subscribe',['/camera/rgb/camera_info',0,'sensor_msgs/CameraInfo'],function() {});
});

Note that I'm also assuming that the width and height don't change over time.