javascript - 如何在用 "onmouseover"显示它并将鼠标放在它上面后保持 div 可见

Question

我正在尝试做一个菜单，当鼠标悬停在按钮上时菜单会展开(就像在附加的 jsfiddle 中一样)

HTML:

<div class="container">
    <div class="row">
        <div class="col-lg-3 col-md-3 col-sm-6 col-xs-12" id="menu">
            <ul>
                <li>
                    <div id="hover" onmouseover="document.getElementById('stuff').style.opacity = 1.0;" onmouseout="setTimeout(function(){document.getElementById('stuff').style.opacity = 0.0;}, 3000);">
                        <a href="">Button</a>
                    </div>
                </li>
            </ul>

        </div>

        <div class="col-lg-9 col-md-9 col-sm-6 col-xs-12" id="main">
            <div id="stuff">stuff</div>
        </div>
    </div>
</div>

CSS:

    #stuff {
    height: 600px;
    width: 100px;
    background-color: red;
    opacity: 0.0;
    -webkit-transition: all 500ms ease-in-out;
    -moz-transition: all 500ms ease-in-out;
    -ms-transition: all 500ms ease-in-out;
    -o-transition: all 500ms ease-in-out;
    transition: all 500ms ease-in-out;
}

https://jsfiddle.net/bfkxmghd/2/

菜单显示正常，我使用 setTimeOut 将其关闭延迟 3 秒，但是如果我将鼠标移到 stuff 上，我如何才能让它保持打开状态？分区？我试过使用 onmouseover="document.getElementById('stuff').style.opacity = 1.0; , 但在这种情况下，即使没有将鼠标放在 hover 上，它也会出现首先是 div。

Answer 1

只需要在您保存的超时时间调用clearTimeout。不需要 jQuery。

var timeout

function showMenu () {
  clearTimeout(timeout)
  document.getElementById('stuff').style.opacity = 1.0;
  timeout = setTimeout(function(){document.getElementById('stuff').style.opacity = 0.0;}, 3000);
}

function hideMenu () {
  clearTimeout(timeout)
  document.getElementById('stuff').style.opacity = 0.0;
}

function keepMenu () {
  clearTimeout(timeout)
}

var hover = document.getElementById('hover')
hover.onmouseover = showMenu

var stuff = document.getElementById('stuff')
stuff.onmouseover = keepMenu
stuff.onmouseout = hideMenu

    #stuff {
        height: 600px;
        width: 100px;
        background-color: red;
        opacity: 0.0;
        -webkit-transition: all 500ms ease-in-out;
        -moz-transition: all 500ms ease-in-out;
        -ms-transition: all 500ms ease-in-out;
        -o-transition: all 500ms ease-in-out;
        transition: all 500ms ease-in-out;
    }

<div class="container">
        <div class="row">
            <div class="col-lg-3 col-md-3 col-sm-6 col-xs-12" id="menu">
                <ul>
                    <li>
                        <div id="hover">
                            <a href="">Button</a>
                        </div>
                    </li>
                </ul>

            </div>

            <div class="col-lg-9 col-md-9 col-sm-6 col-xs-12" id="main">
                <div id="stuff">stuff</div>
            </div>
        </div>
    </div>