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<style>
    /*整流罩*/
    #box1, #box4 {
        display: none; /*隐藏*/
        position: absolute; /*脱离文档流*/
        left: 0px;
        top: 0px;
    }
 
    #box1 {
        z-index: 1001;
        background-color: #000;
        width: 100%;
        height: 2000px;
        opacity: 0.8;
    }
 
    #box4 {
        z-index: 1003;
        left: 43%;
        top: 30%;
        font-size: 13px;
        color: #FFF;
    }
 
    /*文本域样式*/
    #box4 input, textarea {
        background: none;
        font-size: 13px;
        color: #FFF;
    }
</style>
<!---------------------------------------->
<input type='botton' value='触发按钮' onclick="ick_tel()"/>
 
<div id="box4">
    <form>
        <table align='center' style="margin-top:30px">
            <tr>
                <td>内容</td>
                <td>
                    <textarea id="back_text"></textarea>
                </td>
            </tr>
            <tr>
                <td colspan="2">&nbsp;</td>
            </tr>
            <tr>
                <td>
                </td>
                <td>
                    &nbsp;
                    <input type="button" onclick="NO()" value="取&nbsp;消">
                    &nbsp;
                    <input type="button" id="login_button" value="确&nbsp;认">
                </td>
            </tr>
        </table>
    </form>
</div>
<div id="box1"></div>
<!-------------------------------------->
<script>
    /*发言遮罩层*/
    function ick_tel() {
        box1.style.display = 'block';
        box4.style.display = 'block';
    }
    /*取消登录遮罩层*/
    function NO() {
        box1.style.display = 'none';
        box4.style.display = 'none';
    }
</script>
 
  

 

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