https://www.rakuten-sec.co.jp/web/shared/js/app/getjsonp.js

1/*!
2 * Get JSONP data
3 * (c) 2017 Chris Ferdinandi, MIT License, https://gomakethings.com
4 * @param  {String}   url      The JSON URL
5 * @param  {Function} callback The function to run after JSONP data loaded
6 */
7var getJSONP = function ( url, callback ) {
8
9	// Create script with url and callback (if specified)
10	var ref = window.document.getElementsByTagName( 'script' )[ 0 ];
11	var script = window.document.createElement( 'script' );
12	script.src = url + (url.indexOf( '?' ) + 1 ? '&' : '?') + 'callback=' + callback;
13
14	// Insert script tag into the DOM (append to <head>)
15	ref.parentNode.insertBefore( script, ref );
16
17	// After the script is loaded (and executed), remove it
18	script.onload = function () {
19		this.remove();
20	};
21
22};