code: function(url, data, jsonpParam, callbacnName) {
  		if (jsonpParam) {
  			url = url.replace(jsonpParam + '=?', jsonpParam + '=' + callbacnName);
  		} else {
  			data['callback'] = callbacnName;
  		}
  		var buffer = [];
  		for (var key in data) {
  			buffer.push(key + '=' + encodeURIComponent(data[key]));
  		}
  		return url + (url.indexOf('?') > -1 ? '&' : '?') + buffer.join('&');
  	}
docs: 转换 URL，JSONP 只支持 get 方式的 queryString ,需将 data 拼入 url