这是如何运作的？

requestNavigateTo : function(view, opt_params, opt_ownerId) {
  if (typeof view !== "string") {
    view = view.getName();
  }   
  gadgets.rpc.call(null, "requestNavigateTo", null, view, opt_params, opt_ownerId);
},  

gadgets.rpc.register("requestNavigateTo", navigateHandler);
function navigateHandler(view, opt_params) {
   alert(view); }