Question

我想用display:none删除flexbox中的一项，我想将margin-right: auto类项中的logo的右对齐设置为nav。但是，如果我使用display:none，则margin-right: auto无法正常工作。怎么了？也许是其他解决方案，而不是display:none？

* {
    margin: 0;
    padding: 0;
}

body {
    background: white;
}

/*
---------------------------
----------Flexbox----------
---------------------------
*/

.container {
    border: 1px solid red;
}

.header {
    display: flex;
    flex-direction: row;
    height: 80px;
}

.menubtn {
    align-self: center;
    margin-left: 20px;
    font-size: 20px;
    margin-right: auto;
}

.logo {
    align-self: center;
    margin-right: 40px;
}

.nav {
    background: #000;
    color: #FFF;
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    width: 0%;
    opacity: 0;
    text-align: center;
    overflow-x: hidden;
    list-style: none;
    transition: .5s;
    border: 1px solid blue;
}

.closebtn {
    text-align: left;
    margin-left: 30px;
    margin-top: 30px;
}

.nav-item {
    font-size: 1.8em;
}

.nav-item:nth-child(1n+2) {
    margin-top: 3em;
}



/*
---------------------------
--------Responsive---------
---------------------------
*/

@media (min-width: 640px) {

    .closebtn {
        display: none;
    }

    .menubtn {
        display: none;
    }

    .nav {
        transition: 0;
        background: none;
        color: #000;
        display: flex;
        flex-direction: row;
        align-items: center;
        position: static;
        opacity: 1;
        font-size: 0.8em;
        width: auto;
        margin-right: auto;
    }

    .nav-item:nth-child(1n+2) {
        margin-left: 10px;
    }

    .nav-item:nth-child(1n+2) {
        margin-top: 0;
    }
}

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Mineral Fever</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="main.css">
</head>
<body>
    <div class="container">
        <header>
            <div class="header">
                <p class="menubtn" onclick="openNav()">&#9776;</p>
                <nav>
                    <ul id="nav" class="nav">
                        <li class="nav-item closebtn" onclick="closeNav()">&times;</li>
                        <li class="nav-item">Termékek</li>
                        <li class="nav-item">Kapcsolat</li>
                        <li class="nav-item">Szállítás</li>
                    </ul>
                </nav>
                <h1 class="logo">Mineral Fever</h1>
            </div>
        </header>
    </div>
</body>
<script src="main.js"></script>
</html>

Answer 1

由于您已经在Decodable上使用了// Model.swift struct TestCase: Decodable { let content: Content } struct Content: Decodable { let message: [String: String] } // ViewController.swift private var testVariable: [AnyHashable: Any] private func loadJson(filename: String) { if let url = Bundle.main.url(forResource: filename, withExtension: "json") { do { let data = try Data(contentsOf: url) let decoder = JSONDecoder() let jsonData = try decoder.decode(TestCase.self, from: data) // Problem faced testVariable = jsonData // error } catch let jsonError { print("JsonError: ", jsonError) } } }，也许它也和在那里使用display: flex;一样简单……

.header

justify-content

.header {
    display: flex;
    flex-direction: row;
    height: 80px;
    justify-content: space-between;
}

Answer 2

您可以仅将peer channel join添加到margin-right: auto元素-请参见下面的演示

nav

* {
  margin: 0;
  padding: 0;
}

body {
  background: white;
}


/*
---------------------------
----------Flexbox----------
---------------------------
*/

.container {
  border: 1px solid red;
}

.header {
  display: flex;
  flex-direction: row;
  height: 80px;
}

.menubtn {
  align-self: center;
  margin-left: 20px;
  font-size: 20px;
  margin-right: auto;
}

.logo {
  align-self: center;
  margin-right: 40px;
}

nav {
  margin-right: auto; /* added */
}

.nav {
  background: #000;
  color: #FFF;
  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  width: 0%;
  opacity: 0;
  text-align: center;
  overflow-x: hidden;
  list-style: none;
  transition: .5s;
  border: 1px solid blue;
}

.closebtn {
  text-align: left;
  margin-left: 30px;
  margin-top: 30px;
}

.nav-item {
  font-size: 1.8em;
}

.nav-item:nth-child(1n+2) {
  margin-top: 3em;
}


/*
---------------------------
--------Responsive---------
---------------------------
*/

@media (min-width: 640px) {
  .closebtn {
    display: none;
  }
  .menubtn {
    display: none;
  }
  .nav {
    transition: 0;
    background: none;
    color: #000;
    display: flex;
    flex-direction: row;
    align-items: center;
    position: static;
    opacity: 1;
    font-size: 0.8em;
    width: auto;
    margin-right: auto;
  }
  .nav-item:nth-child(1n+2) {
    margin-left: 10px;
  }
  .nav-item:nth-child(1n+2) {
    margin-top: 0;
  }
}

Answer 3

您似乎倒退了。如果要将元素向右推，请为其自动设置左边距（反之亦然）。它可能会帮助您这样思考：边距（不包括负边距）会远离某些事物。在这种情况下，您想将元素推离其父元素的左边缘。自动边距会根据需要增加以占用任何可用空间（只要宽度不算作“自动”即可）。

或者如kukkuz建议的那样，您可以将自动右移边距放在all.equal(out$td_sell_count, out$td_sell_count1) #[1] TRUE元素上。

Flexbox右边距右边：如果我在一个元素中使用display：none，则自动不起作用

3 个答案: