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javascript - 切换按钮 onClick 方法不起作用

问题描述

我不明白为什么这段代码不起作用。

它可以在 jsfiddle 等在线平台上运行，但是当我在 VS Code 实时服务器上尝试时它不起作用。

此代码提供响应式标头。如果页面大小小于 1210 像素，导航栏似乎不会。如果单击按钮，则会出现导航栏。对不起我的英语不好。

https://jsfiddle.net/1n8zv5xL/1/

HTML

<!DOCTYPE html>
<html>
    <head>
        <link rel="stylesheet" type="text/css" href="layout.css">

        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
        <script src="contact.js"></script>
        <script src="preparePage.js"></script>
    </head>

    <body>
        <a id="infoButton" class="infoButton" href="info.html"></a>
        <a id="bodyButton" class="bodyButton" href="body.html"></a>
        <a id="enterButton" class="enterButton" onclick="preparePage(); return false;"></a>
        <a id="leaveButton" class="leaveButton" href="leave.html"></a>
        <a id="contactButton" class="contactButton" onclick="contact(); return false;"></a>
    </body>

    <footer>
    </footer>
</html>

CSS

@import url("https://db.onlinewebfonts.com/c/b2932945dbc71a0a2a4c03dd305cfe3a?family=Bauhaus");
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }


header {   
    background-color:white;
    justify-content: space-between;
    display: flex;
    align-items: center;
    padding: 25px 15%;
    height: 100px;

   
}




li,a,button {
    font-family: "Montserrat", sans-serif;
    font-weight: 500;
    font-size: 16px;
    color: black;
    text-decoration: none;
}

header h1 {
    font-family: "Bauhaus";
    color:rgba(0, 136, 169, 1);
    font-size: 45px;
    
}

button {
    padding: 9px 25px;
    background-color: rgba(0, 136, 169, 1);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease 0s;

}

button:hover {

    background-color: rgba(0, 136, 169, 0.8);
}


html{

    overflow-y: scroll;
}







.navbar-links {
    list-style: none;
  }

.navbar-links li {
    display: inline-block;
    padding: 0px 20px;

}
.navbar-links li a {
    transition: all 0.3s ease 0s;
  }


.navbar-links li a:hover {
    color: rgba(0, 136, 169, 1);
}




.logo {
    width: 500px;
    display: flex;
    flex-direction: initial;
    align-items: center;
    justify-content: space-around;
}

.toggle-button {
    
    top: .75rem;
    right: 1rem;
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
}

.toggle-button .bar {
    height: 3px;
    width: 100%;
    background-color: black;
    border-radius: 10px;
}

  @media screen and (max-width:1210px) {
    header  {
        
        flex-direction: column;
    }
    .navbar-links {
        
        display: flex;
        flex-direction: column;
        
    }
    .toggle-button {
        display: flex;
    }
    .navbar-links.active {
        display: none;
    }
  }

JAVASCRIPT

const toggleButton = document.getElementsByClassName('toggle-button')[0]
const navbarLinks = document.getElementsByClassName('navbar-links')[0]

toggleButton.addEventListener('click', () => {
  navbarLinks.classList.toggle('active')
})

标签： javascript

解决方案

问题出在头上。

您将脚本包含在 head 中，因此它将在文档之前加载。因此，为了让您访问 dom 节点，您应该ready在 jquery 中侦听事件 - 或者您可以将脚本移动到body

例如：

$(function() {

const toggleButton = document.getElementsByClassName('toggle-button')[0]
const navbarLinks = document.getElementsByClassName('navbar-links')[0]

toggleButton.addEventListener('click', () => {
  navbarLinks.classList.toggle('active')
})

})

或者

<!DOCTYPE html>
<html>
    <head>
        <link rel="stylesheet" type="text/css" href="layout.css">
    </head>

    <body>
        <a id="infoButton" class="infoButton" href="info.html"></a>
        <a id="bodyButton" class="bodyButton" href="body.html"></a>
        <a id="enterButton" class="enterButton" onclick="preparePage(); return false;"></a>
        <a id="leaveButton" class="leaveButton" href="leave.html"></a>
        <a id="contactButton" class="contactButton" onclick="contact(); return false;"></a>

        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
        <script src="contact.js"></script>
        <script src="preparePage.js"></script>
    </body>

    <footer>
    </footer>
</html>

这应该够了吧。

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