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First, the server code is processed so that the returned data conforms to a specific format, so that PHP is used here.
The test.php code is as follows
1<?PHP2 $con=mysql_connect("localhost", "root", "root");3 mysql_select_db("Test",$con);4 5 $result=mysql_query("Select Username,password from User");6 while($row=Mysql_fetch_array($result)) {7 $com[] =$row;8 }9 Ten $callback=$_get["Jsonpcallback"]; One $json=json_encode ($com); A Echo $callback.‘ (‘."$json".‘)‘; -?>
The output value of the $json is [{"0": "1", "username": "1", "1": "1", "Password": "1"},{"0": "admin", "username": "admin", "1": "1", " Password ":" 1 "}], is a standard JSON, but this page needs to handle cross-domain, so we need to wrap the JSON into callback ([{" 0 ":" 1 "," username ":" 1 "," 1 ":" 1 "," Password ":" 1 "},{" 0 ":" admin "," username ":" admin "," 1 ":" 1 "," Password ":" 1 "}]) format output to the browser
The HTML code is as follows
1 <!DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd ">2 <HTML>3 <Head>4 <Metahttp-equiv= "Content-type"content= "text/html; charset=utf-8">5 <title>Insert Title here</title>6 <Scriptsrc= "Js/jquery.min.js"type= "Text/javascript"></Script>7 <Script>8 $(function(){9 varURL="http://localhost/test.php";Ten $.ajax ({ One Type:'GET', A Url:url, - DataType:'Jsonp', - Jsonp:'Jsonpcallback', the Success:function(data) { - Alert (json.stringify (data)); - } - }); + }); - </Script> + </Head> A </HTML>
Output results
Jsonp only supports "GET" requests, which is determined by the principle of loading cross-domain data, although jquery uses the $.ajax () function to get the data, but the JSONP to get the data is not Ajax, but the way to dynamically load JS.
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