<?php echo 'hello';?><!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> p { width: 100px; height: 100px; border: 1px solid red; } </style> </head> <body> <p></p> <script type="text/javascript"> var op = document.getElementsByTagName('p')[0]; op.addEventListener('click', function(e) { var xml = new XMLHttpRequest(); xml.onreadystatechange = function() { if(xml.readyState === 4) { if((xml.status >= 200 && xml.status < 300) || xml.status == 304) { document.body.innerHTML+=xml.responseText; } } } xml.open('GET', '002.php', true); xml.send(); }) </script> </body></html>php echo里面的内容为啥不对啊？和ajax，responseText获取的数据不一样，为什么。。
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