javascript - 如何在页面加载时隐藏下拉部分？

Question

我有一个 div，它会在单击按钮后向下滑动。此功能工作正常，但目前下拉部分已在页面加载时切换。在单击按钮之前，如何让它隐藏起来？

JSFiddle 链接:http://jsfiddle.net/maddiwu/xe6xtfqh/

.slide {
    overflow-y: hidden;
    max-width: 100%;
    overflow-x: hidden;
    max-height: 100vw;
    /* approximate max height */
    width:100%;
    /*height: 45vw;*/
    background:#2e2e2e;
    transition-property: all;
    transition-duration: 1s;
    transition-timing-function: cubic-bezier(1, 1, 1, 1);
}
.slide.closed {
    max-height: 0;
}
.banner7 {
    width:80%;
    background:#d8d8d8;
    margin-top:1.5vw;
    padding-top:2vw;
}
.banner8 {
    width:80%;
    background:#2e2e2e;
    margin-top:1vw;
    margin-left:10%;
    padding-top:2vw;
}

<center>
    <div class="banner7" style="margin-bottom:0vw;margin-top:2vw;">
        	<h1 style="color:#B40404;font-size:2.5vw;margin:1.5vw;font-family:Futura;">MAIN SECTION</h1>

        <p style="font-family:Helvetica Neue;font-size:1vw;color:back;margin-left:5vw; margin-right:5vw; text-align:center; margin-top:-1vw;margin-bottom:3vw;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa.</p>
        <table style="width:95%; margin-left:2%;">
            <tr>
                <td>
                    <div style="background:white;width:21vw;margin-top:0vw;margin-bottom:2vw;padding:1vw;">
                        	<h1 style="color:#b40404;font-size:1.5vw;font-family:Futura; text-align:center;margin-top:1vw;">SUB SECTION ONE</h1>

                        <p style="font-family:Helvetica Neue;font-size:1vw;color:#2e2e2e; text-align:center; margin-top:1vw;margin-bottom:1vw;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor.</p>
                        <center>
                            <img src="images/button.png" style="width:35%;height:3vw;margin-top:1vw; margin-bottom:1vw;" onmouseover="this.src='images/button-hover.png'" onmouseout="this.src='images/button.png'" onload="closed" onclick="document.getElementById('slide').classList.toggle('closed');" />
                        </center>
                    </div>
                </td>
                <td>
                    <div style="background:white;width:21vw;margin-top:0vw;margin-bottom:2vw;padding:1vw;">
                        	<h1 style="color:#b40404;font-size:1.5vw;font-family:Futura; text-align:center;margin-top:1vw;">SUB SECTION TWO</h1>

                        <p style="font-family:Helvetica Neue;font-size:1vw;color:#2e2e2e; text-align:center; margin-top:1vw;margin-bottom:1vw;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor.</p>
                        <center>
                            <img src="images/button.png" style="width:35%;height:3vw;margin-top:1vw; margin-bottom:1vw;" onmouseover="this.src='images/button-hover.png'" onmouseout="this.src='images/button.png'" onclick="document.getElementById('slide').classList.toggle('closed');" />
                        </center>
                    </div>
                </td>
                <td>
                    <div style="background:white;width:21vw;margin-top:0vw;margin-bottom:2vw;padding:1vw;">
                        	<h1 style="color:#b40404;font-size:1.5vw;font-family:Futura; text-align:center;margin-top:1vw;">SUB SECTION THREE</h1>

                        <p style="font-family:Helvetica Neue;font-size:1vw;color:#2e2e2e; text-align:center; margin-top:1vw;margin-bottom:1vw;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor.</p>
                        <center>
                            <img src="images/button.png" style="width:35%;height:3vw;margin-top:1vw; margin-bottom:1vw;" onmouseover="this.src='images/button-hover.png'" onmouseout="this.src='images/button.png'" onclick="document.getElementById('slide').classList.toggle('closed');" />
                        </center>
                    </div>
                </td>
            </tr>
        </table>
    </div>
</center>
<div>
    <div class="slide" id="slide">
        <div style="width:100%; background:#2e2e2e; padding:1vw; text-align:center;">
            <table style="width:80%">
                <tr>
                    <td>
                        <iframe style="margin-left:20%;width:45vw;height:30vw;" src="//www.youtube.com/embed/P7mS83pOPso" frameborder="0" allowfullscreen></iframe>
                    </td>
                    <td>
                        <center>
                            	<h1 style="color:#d8d8d8;font-size:2.5vw;font-family:Futura; text-align:center;margin-top:0vw;margin-left:20vw;">DROP SECTION</h1>

                            <p style="font-family:Helvetica Neue;font-size:1vw;color:white;margin-left:11vw;margin-right:-8vw; text-align:center; margin-top:1vw;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem.</p>
                    </td>
                </tr>
            </table>
            </center>
        </div>
        <div style="width:100%; background:#d8d8d8; padding:1vw; text-align:center;">
            <center>
                <center>
                    	<h1 style="color:#b40404;font-size:2.5vw;font-family:Futura; text-align:center;margin-top:2vw;">DROP SECTION</h1>

                    <p style="font-family:Helvetica Neue;font-size:1vw;color:#2e2e2e;margin-right:10vw;margin-left:10vw; text-align:center; margin-top:-1vw;margin-bottom:2vw;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem.</p>
                </center>
                </td>
                </tr>
                </table>
            </center>
        </div>
    </div>
</div>
</div>
<br>

Answer 1

让您的默认 HTML 以 <div class="slide closed" id="slide"> 开头. . .如果切换代码有效(如您所述)并且基于 CSS 定义，则具有 closed默认情况下的类应在页面加载时将其置于关闭状态。