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javascript - 如何在css和javascript中单击时使汉堡可见？

问题描述

我想在媒体屏幕 600 像素中制作汉堡包。我添加了 javascript 让它工作，但它不适用于我的网站！请检查代码并告诉您有什么问题

它显示了这个 weeoe - Uncaught TypeError: Cannot read property 'style' of null

我只希望汉堡包 style.display 如果没有，则更改为“flex”，如果是 flex，则通过单击 hamgurger div 更改为无。 

function showHamburger(){
    var hamburger_icon = document.querySelector("icon");
    if (hamburger_icon.style.display == "none") {
        hamburger_icon.style.display = "flex";
        hamburger_icon.style.flexDirection = "column";
    }else if (hamburger_icon.style.display == "flex") {
        hamburger_icon.style.display = "none";
    }
}
@import url("https://fonts.googleapis.com/css2?family=Ranchers&display=swap");
@import url("https://fonts.googleapis.com/css2?family=Nunito:wght@300&display=swap");
@import url("https://fonts.googleapis.com/css2?family=Merienda&display=swap");
html {
  scroll-behavior: smooth;
}

* {
  margin: 0;
  padding: 0;
  font-size: 100%;
}

::-moz-selection {
  background: #00bbff;
  color: white;
}

::selection {
  background: #00bbff;
  color: white;
}

.navbar {
  font-family: 'Nunito', sans-serif;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
  height: 5em;
  background: white;
  -webkit-box-shadow: 0 8px 6px -6px black;
          box-shadow: 0 8px 6px -6px black;
  position: fixed;
  width: 100%;
  z-index: 100;
}

.navbar .logo {
  margin: 20px 0 0 40px;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
}

.navbar .menu {
  margin: 25px 40px 0;
}

.navbar .menu a {
  text-decoration: none;
  color: black;
  margin: 0 0 0 20px;
  font-size: 20px;
  -webkit-transition: 0.01s ease-in-out;
  transition: 0.01s ease-in-out;
  font-weight: normal;
}

.navbar .menu a:hover:first-child {
  color: green;
  border-bottom: 2px solid green;
}

.navbar .menu a:hover:nth-child(2) {
  color: red;
  border-bottom: 2px solid red;
}

.navbar .menu a:hover:last-child {
  color: #f200ff;
  border-bottom: 2px solid #f200ff;
}

.navbar .logo h1 {
  font-size: 30px;
}

.bars-icon i {
  font-size: 30px;
  margin-top: 20px;
  margin-right: 30px;
}

.bars-icon {
  display: none;
}

.about h1 {
  font-size: 70px;
  font-family: 'Merienda', cursive;
  font-weight: lighter;
  padding: 20px;
  text-justify: inter-word;
}

.about {
  background: -webkit-gradient(linear, left top, right top, from(#2ce61b), to(cyan));
  background: linear-gradient(to right, #2ce61b, cyan);
  border-radius: 50px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  margin-top: 30px;
  padding-bottom: 30px;
  margin-left: 30px;
  margin-right: 30px;
}

.image-of-about {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
}

.image-of-about img {
  border-radius: 50%;
  -webkit-transition: 0.5s ease;
  transition: 0.5s ease;
}

.image-of-about img:hover {
  -webkit-transform: rotate(360deg);
          transform: rotate(360deg);
  cursor: none;
}

.button-of-about {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  margin-top: 30px;
}

.button-of-about a {
  padding: 10px 50px 10px 50px;
  background: red;
  text-decoration: none;
  color: black;
  font-family: "Nunito",sans-serif;
  -webkit-animation-name: bg-change;
          animation-name: bg-change;
  -webkit-animation-duration: 5s;
          animation-duration: 5s;
  -webkit-animation-iteration-count: infinite;
          animation-iteration-count: infinite;
  border-radius: 40px;
  -webkit-transition: 0.3s;
  transition: 0.3s;
  font-size: 30px;
}

.button-of-about a:hover {
  -webkit-transform: scale(1.2);
          transform: scale(1.2);
}

.starting-info p {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  margin-top: 30px;
  font-size: 20px;
  font-family: sans-serif;
}

.text12323 {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
}

.hamburger {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  position: fixed;
  width: 100%;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  margin-top: 10px;
  display: none;
}

.hamburger a {
  padding: 10px;
  border-top: 1px solid black;
  border-bottom: 1px solid black;
  font-family: 'Nunito', sans-serif;
  text-decoration: none;
  color: black;
  background: white;
  -webkit-transition: 0.1s ease;
  transition: 0.1s ease;
}

.hamburger a:first-child:hover {
  background: green;
}

.hamburger a:nth-child(2):hover {
  background: red;
}

.hamburger a:last-child:hover {
  background: pink;
}

@-webkit-keyframes bg-change {
  0% {
    background: red;
  }
  20% {
    background: yellow;
  }
  40% {
    background: #22e918;
  }
  60% {
    background: #00ffe5;
  }
  80% {
    background: #dd00ff;
  }
  100% {
    background: red;
  }
}

@keyframes bg-change {
  0% {
    background: red;
  }
  20% {
    background: yellow;
  }
  40% {
    background: #22e918;
  }
  60% {
    background: #00ffe5;
  }
  80% {
    background: #dd00ff;
  }
  100% {
    background: red;
  }
}

@media only screen and (max-width: 600px) {
  .bars-icon {
    display: block;
    cursor: pointer;
  }
  .menu {
    display: none;
  }
  .about h1 {
    font-size: 50px;
  }
}
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Aviral</title>
    <script src="https://kit.fontawesome.com/978a1c194b.js" crossorigin="anonymous"></script>
    <link rel="shortcut icon" href="../images/MY PICTURE copy.jpg" type="image/x-icon">
    <link rel="stylesheet" href="../styles/home.css">
</head>
<body>
    <div class="navbar">
        <div class="logo"><h1>Aviral</h1></div>

        <div class="menu">
            <a href="learn.html">Learn</a>
            <a href="skills.html">Skills</a>
            <a href="works.html">Contact</a>
        </div>

        <div class="bars-icon" id="icon" onclick="showHamburger()">
            <i class="fas fa-bars"></i>
        </div>
    </div><br><br><br><br>
    <div class="hamburger">
        <a href="learn.html">Learn</a>
        <a href="skills.html">Skills</a>
        <a href="works.html">Contact</a>
    </div><br><br><br><br><br>

    <div class="about">
        <div>
            <h1>Hi, I am Aviral</h1>
    
            <div class="image-of-about">
                <img src="../images/MY PICTURE copy.jpg" alt="Picture of Aviral" id="my-image">
            </div>

            <div class="starting-info">
                <p style="padding: 15px;">I am Aviral,12 year old kid!
                </p>
            </div>
            <div class="button-of-about">
                <a href="">Contact</a>
            </div>
        </div>
    </div>
    
    <script src="../js/script.js"></script>
</body>
</html>

标签： javascripthtmlcss

解决方案

欢迎来到堆栈溢出！

你很亲密。在你的 JavaScript 中你有document.querySelector("icon")，但是为了选择一个你必须做的id的元素，即。. 或者，您可以执行. 给猫剥皮的方法总是不止一种:)icon#icondocument.querySelector("#icon")document.getElementById("icon")

目前发生的事情document.querySelector("icon")并没有给你任何东西，所以它是null，这意味着那hamburger_icon是null，所以当你尝试去时hamburger_icon.style，它基本上是null.style，它给你错误。

如果你很好奇，document.querySelector("icon")会尝试寻找一个名为“icon”的元素，就像如何document.querySelector("div")寻找 a<div>和如何document.querySelector("h1")寻找 一样<h1>。

小提示：您在组织代码并使其正确标签化以及所有这些方面做得很好，但下次请查看此页面以更好地格式化内容。特别是我想到的是对代码跨度使用反引号，like this.

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