exemplo-jsonp.html

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script>
	window.meu_callback = function (resposta) {
	    console.log(resposta);
	    alert('O preco é: ' + resposta.preco);
	};

	var src = 'http://localhost:8081/api_result.html?cliente=2336&produto=45&quantidade=73&callback=meu_callback';
	var script = document.createElement('script');
	script.src = src;
	document.body.appendChild(script);
</script>
</body>
</html>