AJAX 異步傳輸數(shù)據(jù)的問(wèn)題

要異步傳輸?shù)臄?shù)據(jù)：
Xml代碼
....
<action xsi:type="basic:JavaScript" script="index += 1;"/>
....
Ajax異步傳輸代碼：
Js代碼
代碼如下:
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);

postData在encode和unencode，最終導(dǎo)致在后臺(tái)Servlet中得到得到數(shù)據(jù)+被空格代替，使得script中的index += 1;變成了index = 1;從而導(dǎo)致后臺(tái)Java代碼在跑script出現(xiàn)死循環(huán)。
在網(wǎng)上搜索，發(fā)現(xiàn)content-type使用application/x-www-form-urlencoded后：
[來(lái)自http://www.w3.org/TR/html401/interact/forms.html#h-17.13.4.1]寫(xiě)道
代碼如下:
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').

然而使用form來(lái)提交方式來(lái)發(fā)起request卻不會(huì)出現(xiàn)類似的問(wèn)題，而form默認(rèn)的Content-Type也是application/x-www-form-urlencoded:
Js代碼
代碼如下:
$('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();

仍未發(fā)現(xiàn)問(wèn)題到底出在何處，暫做備忘。暫時(shí)把script中的‘+'都用‘-'代替，index += 1;改成index -= -1;呵呵，以后有人看到這段自動(dòng)生成的詭異腳本，不知道會(huì)作何感想，但現(xiàn)在也只能如此。

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