跨域http请求

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<?php header("Access-Control-Allow-Origin: *"); header("Content-Type: application/json; charset=UTF-8");   $conn = new mysqli("myServer", "myUser", "myPassword", "Northwind");   $result = $conn->query("SELECT CompanyName, City, Country FROM Customers");   $outp = ""; while($rs = $result->fetch_array(MYSQLI_ASSOC)) {     if ($outp != "") {$outp .= ",";}     $outp .= '{"Name":"'  . $rs["CompanyName"] . '",';     $outp .= '"City":"'   . $rs["City"]        . '",';     $outp .= '"Country":"'. $rs["Country"]     . '"}'; } $outp ='{"records":['.$outp.']}'; $conn->close();   echo($outp); ?>

　　关键是这句：

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1	header("Access-Control-Allow-Origin: *");