var hidvalue_str="需要显示的信息";
    var divWidth=100;
    var divHeight=100;
    var iLeft=($(window).width()-divWidth)/2;
    var iTop=($(window).height()-divHeight)/2+$(document).scrollTop();
    var divhtml=$("<div>"+hidvalue_str+"</div>").css({position:'absolute',top:iTop+'px',left:iLeft+'px',display:'none',width:divWidth+'px',height:divHeight+'px'});
    divhtml.appendTo('body').fadeIn();
    divhtml.appendTo('body').fadeOut(3000);     

 

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