1 (function(window, document, undefined) { 2   'use strict'; 3   var jsonp = function(url, data, callback) { 4     var fnSuffix = Math.random().toString().replace('.', ''); 5     var cbFuncName = 'my_json_' + fnSuffix; 6     window[cbFuncName] = callback; 7     var querystring = url.indexOf('?') == -1 ? '?' : '&'; 8     for (var key in data) { 9       querystring += key + '=' + data[key] + '&';10     }11     querystring += 'callback=' + cbFuncName;12     var scriptElement = document.createElement('script');13     scriptElement.src = url + querystring;14     document.body.appendChild(scriptElement);15   };16   window.$jsonp = jsonp;17 })(window, document);

调用

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