//所谓跨域，根据同源策略缘故
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<button id="button" name="button" onclick="jsonp()">button</button>
<div id="div1"></div>
</body>
<script>
function jsonp(){
var s1=document.createElement("script");
s1.src="2.php?cb=show";
document.body.appendChild(s1);
}
var dd=document.getElementById("div1");
function show(data){
dd.innerHTML=data.name;
}
</script>
</html>
php文件如下，此时通过参数cb来了接的，这样就是是
<?php $show=$_GET['cb']; $xjson="{'name':'user1'}"; echo $show."(".$xjson.")"; ?>