我想使用
select t1.* from temp_vendor t1
where exists ( select 1 from temp_vendor t2 where t1.material=t2.material
having count(distinct vendor)=1)
但是，无论是否有var http = require('http');
var fs = require('fs');
var url = require('url');
var app = http.createServer(function(request, response){
var _url = request.url;
var queryData = url.parse(_url, true).query;
console.log(queryData);
if(_url == '/'){
_url = '/index.html';
}
if(_url == '/favicon.ico'){
return response.writeHead(404);
}
response.writeHead(200);
response.end(fs.readFileSync(__dirname + _url));
});
app.listen(4040);
这样的结果，无论何时我单击网页，终端都会继续向我发送此代码
{id: 'HTML'}如何解决这个问题？