AJAX 异步传输数据的问题

　　var postData = "input="+ escape(inputJSON) +"&script="+escape(xml)+

　　"&feedGeneral=" + escape(feedGeneral);

　　XmlHttpRequest.open("POST",url,true);

　　XmlHttpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded");

　　XmlHttpRequest.send(postData);

　　Control names and values are escaped. Space characters are replaced by `+', and then reserved characters are escaped as

　　described in [RFC1738], section 2.2: Non-alphanumeric characters are replaced by `%HH', a percent sign and two hexadecimal

　　digits representing the ASCII code of the character. Line breaks are represented as "CR LF" pairs (i.e., `%0D%0A').

　　$('test').innerHTML = "<form target='_blank' id='test_form' action='./gen_feed' method='post'>"

　　+ "<input type='text' name='input' /><input type='text' name='script' />"

　　+ "<input type='text' name='feedGeneral' /><input type='hidden' name='format' value='" + this.feed_type + "'

　　/>"

　　+ "<input type='submit' value='gen' /></form>";

　　var test_form = $('test_form');

　　test_form.elements[0].value = inputJSON;

　　test_form.elements[1].value = script;

　　test_form.elements[2].value = feedGeneral;

　　test_form.submit();