如果您不需要pdf的数据，只需使用iframe而不是object，

    <div class="tip-win is-display">
        <div class="tip-head">
            <span class="tip-title">Tips</span>
            <span class="close-btn" id="close-btn">✖&lt;/span>
        </div>

        <div class="tip-content" id="tip-content">
            <div>This is a test message</div>
        </div>
        <div class="tip-foot">
            <a class="mini-button blue tip-btn" id="ok-btn">ok</a>
            <a class="mini-button blue tip-btn" id="cancel-btn">cancel</a>
        </div>
    </div>

    <div class="tip-div">
        <iframe id="tip-iframe" class="tip-iframe is-display" height="422" width="602" ></iframe>
    </div>

    <div class="pdf-iframe" id="targetElementID">
        <iframe id="ipdf" src="yyytest.pdf" height="100%" width="100%"></iframe>

    </div>

    css:
    .tip-win {
        position: absolute;
        z-index: 100;
        background: #f6f6f6;
        border: 1px solid #bbb;
        height: 420px;
        width: 600px;
        top: 15%;
        left: 30%
    }

    .tip-div {
        position: absolute;
        z-index: 20;
        top: 15%;
        left: 30%
    }

    .pdf-iframe {
        position: absolute;
        z-index: 10;
        margin-top: 45px;
        height: 90%;
        width: 100%
    }
    .tip-iframe{
        border:none;
    }
    .is-display{
        display: none;
    }
    .tip-head{
        border-bottom: 1px solid #ddd;
        background: #eee;
    }
    .tip-title{
        display: inline-block;
        margin: 5px 20px;
    }
    .close-btn{
        height: 32px;
        line-height: 32px;
        float: right;
        text-align: center;
        width: 32px;
        border-left: 1px solid #bbb;
    }
    .close-btn:hover{
        cursor: pointer;
        background: #ccc;
    }
    .tip-content{
        height: 336px;
        overflow-y: scroll;
        padding-left: 20px;
    }
    .tip-foot{
        border-top: 1px solid #ddd;
        padding: 10px;
        text-align: center;
        background: #eee;
    }
    .tip-btn{
        font-size: 12px;
        padding: 4px 16px !important;
    }

    <script>
    $('#tip-content').html(message);   

        $('.is_display').css('display','block');   
        $('.sb-btn').attr('disabled','disabled'); 

        $('.tip-btn').click(function(){  
            var id = $(this).attr('id');
            if(id==="ok-btn"){
                closeTip();
                send2SB02();
            }else{
                closeTip();
            }
        });
        // “X”
        $('#close-btn').click(closeTip);

    function closeTip() {
        $('.is_display').css('display','none');   
        $('.sb-btn').removeAttr('disabled'); 
        return false;
    }
    </script>