# aardio 范例: event-stream
```aardio
//event-stream
import win.ui;
/*DSG{{*/
var winform = win.form(text="web.view - event-stream";right=753;bottom=434)
winform.add()
/*}}*/
import web.view;
var wb = web.view(winform);
//启动多线程 HTTP 服务器
import wsock.tcp.simpleHttpServer;
wb.eventSourceUrl = wsock.tcp.simpleHttpServer.startUrl(
function(response,request,session){
response.headers["Access-Control-Allow-Origin"] = "*"
while (true) {
response.eventStream(
event = "ping";
data = { time = time() };
)
sleep(1000);
}
}
)
//HTML 支持 aardio 模板语法（可嵌入 aardio 代码，owner 参数为 wb 对象）
wb.html = /**
**/
winform.show();
win.loopMessage();
```