php 学习记录 ajax responseXML Text

在XHR(XMLHttpRequest)1.0标准中response 只有 xml 和 text , json 也是 text

一:XML

<script type="text/javascript">
XHR = new XMLHttpRequest();
XHR.open('POST','1.php',true);
XHR.setRequestHeader("Content-type","application/x-www-form-urlencoded");
XHR.send(null);

//alert(XHR.status+XHR.statusText+"readyState"+XHR.readyState);
XHR.onreadystatechange=function(){
if(XHR.readyState == 4)
{
var xml = XHR.responseXML;
var book = xml.getElementsByTagName('book')[0];
alert(book.lastChild.firstChild.nodeText);
}
};  </script>

php 端

<?php
header('Content-type:text/xml');
?>
<xml version='1.0' encoding='utf-8'>
<root>
<book><name>火影忍者</name><price>35.5</price></book>
</root>
</xml>

二 json

主要注意,js中

eval("({title:'天龙八部',price:30})")

在字符串的两段要加上 () 

<script type="text/javascript">

XHR = new XMLHttpRequest();
XHR.open('POST','1.php',true);
XHR.setRequestHeader("Content-type","application/x-www-form-urlencoded");
XHR.send(null);
XHR.onreadystatechange=function(){
if(XHR.readyState == 4)
{
var book = eval('('+XHR.responseText+')');
alert(book.intro);
}
};  </script>

php端

<?php
//header('Content-type:text/xml');
?>
{title:'阿童木',intro:'铁臂阿童木'}