//该方法参数 content：需要打印的元素
printFun = (content) =>{
        var Window = window.open("", "页面打印", "toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=yes, copyhistory=no");
        var style = "<style type='text/css'></style>";
        Window.document.write(content + style);
        Window.focus();
        Window.document.close();     //关闭document的输出流, 显示选定的数据
        Window.print();               //打印当前窗口
        return Window;
    }

var windows = this.print(document.getElementById('billDetails').innerHTML);
    windows.close();