jsonp跨域

(function(window, document, undefined) {
  'use strict';
  var jsonp = function(url, data, callback) {
    var fnSuffix = Math.random().toString().replace('.', '');
    var cbFuncName = 'my_json_' + fnSuffix;
    window[cbFuncName] = callback;
    var querystring = url.indexOf('?') == -1 ? '?' : '&';
    for (var key in data) {
      querystring += key + '=' + data[key] + '&';
    }
    querystring += 'callback=' + cbFuncName;
    var scriptElement = document.createElement('script');
    scriptElement.src = url + querystring;
    document.body.appendChild(scriptElement);
  };
  window.$jsonp = jsonp;
})(window, document);

调用

  <div id="result"></div>
  <script>
    (function() {
      $jsonp(
        'http://api.xxx..com/xx/xx', {
          page: 10,
          count:15
        },
        function(data) {
          document.getElementById('result').innerHTML = JSON.stringify(data);
        });
    })();
  </script>