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javascript,css,z-index,div堆叠

作者：互联网

我想创建一种仅在页面内的单个DIV上起作用的浅色/厚框.
当我的火花触发时,第一个div(phantom_back)会按照我的期望运行,但第二个phantom_top会在phantom_back之后设置其自身,而不管其z索引和位置如何.

我究竟做错了什么？

这是我到目前为止的内容：

<html>
<head>
    <script type="text/javascript">
    <!--//
        function phantom_back(image)
        {
            document.getElementById('phantom_back').style.zIndex = 100;
            document.getElementById('phantom_back').style.height = '100%';
            document.getElementById('phantom_back').style.width = '100%';
            phantom_top();
        }

        function phantom_top(image)
        {
            document.getElementById('phantom_top').style.zIndex = 102;
            document.getElementById('phantom_top').style.height = 600;
            document.getElementById('phantom_top').style.width = 600;
            document.getElementById('phantom_top').style.top = 0;
            document.getElementById('phantom_top').style.left = 0;
        }
    //-->
    </script>
</head>
<body>
    <a href="#" onclick="phantom_back()">Change</a>

    <div style="height: 700px; width: 700px; border: 2px black solid; margin:0 auto; background-color: red;" id="overlord">
        <div style="height: 10px; width: 10px; position: relative; z-index: -1; background-color: #000000; filter:alpha(opacity=50); -moz-opacity:0.5; -khtml-opacity: 0.5; opacity: 0.5;" id="phantom_back"></div>

        <div style="height: 10px; width: 10px; position: relative; z-index: -3; margin: 0 auto; background-color: green;" id="phantom_top">asdf</div>
    </div>

</body>
</html>

我一直在徘徊,为什么我找不到的所有教程都提供这样的东西.

解决方法:

所以,我明白了.我在phantom_back上设置了绝对位置,而没有尝试重新堆叠它们,而是设置了可见性.当我尝试设置z-index时,它会崩溃.

<html>
<head>
    <script type="text/javascript">
    <!--//
        function phantom_back(image)
            {
                document.getElementById('phantom_back').style.height = 700;
                document.getElementById('phantom_back').style.width = 700;
                document.getElementById('phantom_back').style.zIndex = 50;
                phantom_top();
            }

        function phantom_top()
            {
                document.getElementById('phantom_top').style.height = 600;
                document.getElementById('phantom_top').style.width = 600;
                document.getElementById('phantom_top').style.visibility = "visible";
            }
    //-->
    </script>
</head>
<body>
    <a href="#" onclick="phantom_back()">Change</a>

    <div style="height: 700px; width: 700px; border: 2px black solid; margin:0 auto; background-color: red;" id="overlord">
        <div style="height: 10px; width: 10px; position: absolute; z-index: -1; background-color: #000000; filter:alpha(opacity=50); -moz-opacity:0.5; -khtml-opacity: 0.5; opacity: 0.5;" id="phantom_back"></div>

        <div style="margin: 0 auto; text-align: center; height: 10px; width: 10px;  position: relative; z-index: 102; top: 10px; background-color: white; visibility: hidden;" id="phantom_top"><br /><br /><img src="load.gif"></div>
    </div>

</body>
</html>

标签：z-index,css,html,javascript
来源： https://codeday.me/bug/20191024/1921574.html