<style>#pageloading{position:absolute; left:0px; top:0px;background:white url(‘../images/loading.gif‘) no-repeat center; width:100%; height:700px;z-index:99999;}</style><div style="position:relative;">    <div id="pageloading" style="display:none"></div>    <iframe frameborder="0" name="home" id="home" src="" width="100%" height="700"></iframe></div><button type="button" id="button">Click Me!</button><script>$("#home").on("load",function(){    $("#pageloading").hide();});$(‘#button‘).click(function(){    $("#pageloading").show();    $(‘#home‘).attr(‘src‘,‘www.baidu.com‘);    });</script>