问题:

I am looking for solution how to get/send the data from/to another domain using JSONP in the Web Workers.

Since the Web Workers have not access to the DOM it is not possible to append the <script> tag with the url and callback parameter to the <head> tag from Web Workers.

Does anybody know, how to get/post the data from/to another domain using JSONP and Web Workers?

Thanks,

回答1:

CORS is a specification which has nothing to do with JSONP beyond making it obsolete in newer browsers. It enables cross-domain requests using ordinary XMLHttpRequest calls.

Here's an overview of how it works and how to use it. It can be used in Firefox 3.5+, Safari 4+, Chrome 3+, Internet Explorer 8+, and anything else using one of the same engines.

回答2:

Have a look at this code:

// Helper function to make the server requests 
function MakeServerRequest() 
{
    importScripts("http://SomeServer.com?jsonp=HandleRequest");
} 

// Callback function for the JSONP result 
function HandleRequest(objJSON) 
{
    // Up to you what you do with the data received. In this case I pass 
    // it back to the UI layer so that an alert can be displayed to prove 
    // to me that the JSONP request worked. 
    postMessage("Data returned from the server...FirstName: " 
                  + objJSON.FirstName + " LastName: " + objJSON.LastName);
} 

// Trigger the server request for the JSONP data 
MakeServerRequest();