var originalHeight=document.documentElement.clientHeight || document.body.clientHeight;

window.onresize=function(){
//軟鍵盤彈起與隱藏  都會引起視窗的高度發生變化
var  resizeHeight=document.documentElement.clientHeight || document.body.clientHeight;

    if(resizeHeight*1<originalHeight*1){ //resizeHeight<originalHeight
 
證明視窗被擠壓了
$('.dibtab').css('display','none');
        $(".mui-iframe-wrapper").css('bottom','0px');
    }else{
$('.dibtab').css('display','block');
        $(".mui-iframe-wrapper").css('bottom','50px');
    }
}