PHP响应头

(1)text/plain

服务器端：

header('Content-Type: text/plain');

echo 'succ';

客户端：

if(xhr.responseText==='succ'){ ... }

(2)text/html

服务器端：

header('Content-Type: text/html');

echo "<tr><td>$data</td></tr>";

客户端：

tbody.innerHTML = xhr.responseText

(3)application/javascript

服务器端：

header('Content-Type: application/javascript');

echo "alert($data); f1(); f2($data)";

客户端：

eval( xhr.responseText )

(4)application/xml

服务器端：

header('Content-Type: application/xml');

echo "<bookList><book>$b</book></bookList>";

客户端：

var document = xhr.responseXML

(5)application/json

服务器端：

header('Content-Type: application/json');

//echo "[ {"bname":"","price":35.5},{} ]";

$list = ...;

echo json_encode($list);

客户端：

var obj = JSON.parse( xhr.responseText )