1.后端代码

var dp = 456;
var back = 'callback(\{\dp\ : \ ' + dp  + '\ }\)';
res.send(back);	 

  2.前端代码

<script type="text/javascript">
		function callback(data){
			console.log(data);
		}
		
		
</script>
<script type="text/javascript" src="http://127.0.0.1:3000/jsonp"></script>

  

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