javascript 跨域调用数据 基础原理

<script type="text/javascript">
// This is our function to be called with JSON data

function tet(data)
{
    alert("ty: " + data.a + ", tr: " + data.b);
}

var url = "http://ganbaobao.com.cn/test.php?callback=tet"; // URL of the external script
// this shows dynamic script insertion
var script = document.createElement('script');
script.setAttribute('src', url);

// load the script
document.getElementsByTagName('head')[0].appendChild(script); 

</script>

 

$prot = array('a'=>'121abc','b'=>'11a1b12c','c'=>'11assbc','d'=>'11ffgaerbc','e'=>'11adsabc');
$json = JSON($prot);
echo $_GET['callback'].'('.$json.')';