Java:
boolean jsonP = false;
String cb = request.getParameter("callback");
if (cb != null) {
jsonP = true;
response.setContentType("text/javascript");
} else {
response.setContentType("application/x-json");
}
Writer out = response.getWriter();
if (jsonP) {
out.write(cb + "(");
}
out.print(dataBlock.toJsonString());
if (jsonP) {
out.write(");");
}PHP:
$callback = $_REQUEST['callback'];
// Create the output object.
$output = array('a' => 'Apple', 'b' => 'Banana');
//start output
if ($callback) {
header('Content-Type: text/javascript');
echo $callback . '(' . json_encode($output) . ');';
} else {
header('Content-Type: application/x-json');
echo json_encode($output);
}ASP.net:
String jsonString = "{success: true}";
String cb = Request.Params.Get("callback");
String responseString = "";
if (!String.IsNullOrEmpty(cb)) {
responseString = cb + "(" + jsonString + ")";
} else {
responseString = jsonString;
}
Response.Write(responseString);
<html>
<head>
<script type='text/javascript'>
function mycallback(record) {
alert(record);//record是返回的數據
}
function jsonPRequest(){
var url = 'http://www.xxx.com/jsonP/request_data.php?callback=mycallback';
var script = document.createElement('script');
script.setAttribute('src',url);
document.getElementsByTagName('head')[0].appendChild(script);
}
</script>
</head>
<body>
<!-- 點此按鈕請求數據 -->
<button οnclick='void jsonPRequest();'>請求數據</button>
</body>
</html>