POST请求下载文件

/*===================post请求下载文件
 * options:{
 * url:'',  //下载地址
 * data:{name:value}, //要发送的数据
 * method:'post'
 * }
 */
var postDownLoadFile = function(options) {
		var config = $.extend(true, {
			method: 'post'
		}, options);
		var $iframe = $('<iframe id="down-file-iframe" />');
		var $form = $('<form target="down-file-iframe" method="' + config.method + '" />');
		$form.attr('action', config.url);
		for (var key in config.data) {
			$form.append('<input type="hidden" name="' + key + '" value="' + config.data[key] + '" />');
		}
		$iframe.append($form);
		$(document.body).append($iframe);
		$form[0].submit();
		$iframe.remove();
	}

	//导出
	$("#btnExport_year").on('click', function() {
		var param = {};
		postDownLoadFile({
			url: path + '/monthlyCollection/exportExcelDoc.json',
			data: param,
			method: 'post'
		});
	});