Detailed explanation of Vue instructions: v-model, v-if, v-for, etc.-Vue.js-php.cn

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Detailed explanation of Vue instructions: v-model, v-if, v-for, etc.

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Jun 09, 2023 pm 04:06 PM

- vue - v-model - v-if

With the continuous development of front-end technology, front-end framework has become an important part of modern web application development. Among them, Vue.js, as an excellent and lightweight MVVM framework, is favored by front-end developers. The Vue.js command is a very important functional module in the Vue.js framework. Among them, v-model, v-if, v-for and other commands are indispensable tools for developing Vue.js applications. Below we will analyze the usage and function of these instructions in detail.

1. v-model directive

The v-model directive is used to bidirectionally bind form elements to Vue instance data. When the value of the form element changes, the Vue data will change accordingly. renew. The v-model directive can be applied to form elements such as , , <select>. The syntax is as follows: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><input v-model="message" /></pre><div class="contentsignin">Copy after login</div></div><p> Among them, "message" represents the data object in the Vue instance. This data object can be accessed through this.message in the Vue instance. When the value of a form element changes, the data in the Vue instance is updated accordingly. In this process, the v-model instructions play an extremely important role. They implement two-way binding of form elements and Vue instance data, making code writing very simple. </p><p>2. v-if instruction</p><p>The v-if instruction is used to control the display or hiding of DOM elements based on conditional judgment. When the value of the v-if directive expression is true, the DOM element will be rendered, otherwise, it will be removed from the DOM tree. The v-if directive can be applied to any DOM element. The syntax is as follows: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><div v-if="isShow"> 这是需要显示的内容。 </div> </pre><div class="contentsignin">Copy after login</div></div><p> In this example, "isShow" is a data object in the Vue instance, indicating whether the <div> element currently needs to be displayed. . When "isShow" is true, the <div> element will be rendered, otherwise it will be removed from the DOM tree. </p><p>3. v-for instruction</p><p>The v-for instruction can map a set of data into a list, and can perform list operations based on the value of each data item. The v-for directive can be applied to any DOM element. The syntax is as follows: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><ul> <li v-for="item in dataList">{{item}}</li> </ul> </pre><div class="contentsignin">Copy after login</div></div><p>In this example, "dataList" represents an array object in the Vue instance. The v-for directive will traverse this array and Maps each element in the array to a <li> element. Among them, "item" represents the currently traversed array element. Various operations can be performed on the <li> element, such as sorting, filtering, event processing, etc. on the list. </p><p>4. v-bind instruction</p><p>The v-bind instruction is also a very important instruction in Vue.js. It can bind the data object in the Vue instance to the attributes of the DOM element. . The v-bind directive can be applied to any DOM element. The syntax is as follows: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><button v-bind:class="{'active': isActive}"> 点击 </button> </pre><div class="contentsignin">Copy after login</div></div><p>In this example, "isActive" represents a data object in the Vue instance, and the v-bind directive binds it to < ;button> on the class attribute of the element. When "isActive" is true, this button will be set to the "active" style class. </p> <p>Summary</p> <p> v-model, v-if, v-for, v-bind and other instructions are very important instructions in Vue.js development. Using these instructions, various functions and effects can be easily implemented, greatly improving development efficiency. Of course, when using these instructions, we also need to pay attention to their various details to avoid unnecessary errors. </p><p>The above is the detailed content of Detailed explanation of Vue instructions: v-model, v-if, v-for, etc.. For more information, please follow other related articles on the PHP Chinese website!</p> </div> </div> <div class="wzconShengming_sp"> <div class="bzsmdiv_sp">Statement of this Website</div> <div>The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. 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How to use v-on:click.once in Vue</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/566430.html" title="Tips and best practices for using single-file components to implement component modularization in Vue" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/000/465/014/168765194525407.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="Tips and best practices for using single-file components to implement component modularization in Vue" /> </a> <a href="https://www.php.cn/faq/566430.html" title="Tips and best practices for using single-file components to implement component modularization in Vue" class="phphistorical_Version2_mids_title">Tips and best practices for using single-file components to implement component modularization in Vue</a> <span class="Articlelist_txts_time">Jun 25, 2023 am 08:12 AM</span> <p class="Articlelist_txts_p">Vue is a popular JavaScript framework that is widely used to develop single-page applications and dynamic websites. Among them, componentization and modularization are one of its core features. Vue uses Single-File Components (SFC) to implement modularization of components and improve the efficiency of writing, maintaining and testing components. This article will introduce tips and best practices for using single-file components to modularize Vue components. What is a single file component? Single file component refers to</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/556600.html" title="Detailed explanation of Vue instructions: v-model, v-if, v-for, etc." class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/000/887/227/168629797685231.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="Detailed explanation of Vue instructions: v-model, v-if, v-for, etc." /> </a> <a href="https://www.php.cn/faq/556600.html" title="Detailed explanation of Vue instructions: v-model, v-if, v-for, etc." class="phphistorical_Version2_mids_title">Detailed explanation of Vue instructions: v-model, v-if, v-for, etc.</a> <span class="Articlelist_txts_time">Jun 09, 2023 pm 04:06 PM</span> <p class="Articlelist_txts_p">With the continuous development of front-end technology, front-end framework has become an important part of modern web application development. Among them, Vue.js, as an excellent and lightweight MVVM framework, is favored by front-end developers. The Vue.js command is a very important functional module in the Vue.js framework. Among them, v-model, v-if, v-for and other commands are indispensable tools for developing Vue.js applications. Below we will analyze the usage and function of these instructions in detail. 1. v-mo</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/682205.html" title="How Vue implements file upload function" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/000/465/014/170833819649548.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="How Vue implements file upload function" /> </a> <a href="https://www.php.cn/faq/682205.html" title="How Vue implements file upload function" class="phphistorical_Version2_mids_title">How Vue implements file upload function</a> <span class="Articlelist_txts_time">Feb 19, 2024 pm 06:23 PM</span> <p class="Articlelist_txts_p">How to implement vue's Upload function. With the development of web applications, the file upload function has become more and more common. Vue is a popular JavaScript framework that provides a convenient way to build modern web applications. In Vue, you can implement the file upload function by using Vue's Upload component. This article will introduce how to use Vue to implement the file upload function and provide specific code examples. First, install the required dependencies in the Vue project. You can use n</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/611595.html" title="How to use Vue to implement tag cloud effects" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/000/465/014/169519450021650.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="How to use Vue to implement tag cloud effects" /> </a> <a href="https://www.php.cn/faq/611595.html" title="How to use Vue to implement tag cloud effects" class="phphistorical_Version2_mids_title">How to use Vue to implement tag cloud effects</a> <span class="Articlelist_txts_time">Sep 20, 2023 pm 03:21 PM</span> <p class="Articlelist_txts_p">How to use Vue to implement tag cloud effects Introduction: Tag cloud is a common web page effect that displays tags with different font sizes to show the popularity or relevance of tags. In this article, we will introduce how to use the Vue framework to implement tag cloud effects and provide specific code examples. Step 1: Build a Vue project First, we need to build a basic Vue project. You can use VueCLI to quickly generate a project skeleton. Open the command line tool and enter the following command: vuecreate</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/633390.html" title="Vue and Vue-Router: How to use routing information in components?" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/000/000/164/170279197341781.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="Vue and Vue-Router: How to use routing information in components?" /> </a> <a href="https://www.php.cn/faq/633390.html" title="Vue and Vue-Router: How to use routing information in components?" class="phphistorical_Version2_mids_title">Vue and Vue-Router: How to use routing information in components?</a> <span class="Articlelist_txts_time">Dec 17, 2023 pm 01:46 PM</span> <p class="Articlelist_txts_p">Vue and Vue-Router: How to use routing information in components? Introduction: During the development process of Vue.js, it is often necessary to obtain and use routing information in components, such as obtaining current URL parameters, jumping between different pages, etc. Vue.js provides the Vue-Router plug-in to implement front-end routing functions. This article will introduce how to use Vue-Router in components to obtain and utilize routing information. Introduction to Vue-Router: Vue-Router is Vue</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/561833.html" title="nextTick function in Vue3: processing operations after DOM update" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/000/887/227/168705396972671.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="nextTick function in Vue3: processing operations after DOM update" /> </a> <a href="https://www.php.cn/faq/561833.html" title="nextTick function in Vue3: processing operations after DOM update" class="phphistorical_Version2_mids_title">nextTick function in Vue3: processing operations after DOM update</a> <span class="Articlelist_txts_time">Jun 18, 2023 am 10:06 AM</span> <p class="Articlelist_txts_p">Vue3 is a very popular front-end framework recently. Its biggest feature is virtual DOM technology, that is, Vue will convert the real DOM tree into a virtual DOM tree, and then convert it into a real DOM tree after operating on the virtual DOM tree. DOM tree. This technology allows us to operate DOM more efficiently, and can also achieve very good performance when the number of DOM is large. However, due to the particularity of virtual DOM technology, when we operate DOM, sometimes we cannot get the latest DO immediately.</p> </div> </div> <a href="https://www.php.cn/web-designer.html" class="phpgenera_Details_mainL4_botton"> <span>See all articles</span> <img src="/static/imghw/down_right.png" alt="" /> </a> </div> </div> </div> </main> <footer> <div class="footer"> <div class="footertop"> <img src="/static/imghw/logo.png" alt=""> <p>Public welfare online PHP training，Help PHP learners grow quickly！</p> </div> <div class="footermid"> <a href="https://www.php.cn/about/us.html">About us</a> <a href="https://www.php.cn/about/disclaimer.html">Disclaimer</a> <a href="https://www.php.cn/update/article_0_1.html">Sitemap</a> </div> <div class="footerbottom"> <p> © php.cn All rights reserved </p> </div> </div> </footer> <input type="hidden" id="verifycode" value="/captcha.html"> <script>layui.use(['element', 'carousel'], function () {var element = layui.element;$ = layui.jquery;var carousel = layui.carousel;carousel.render({elem: '#test1', width: '100%', height: '330px', arrow: 'always'});$.getScript('/static/js/jquery.lazyload.min.js', function () {$("img").lazyload({placeholder: "/static/images/load.jpg", effect: "fadeIn", threshold: 200, skip_invisible: false});});});</script> <script src="/static/js/common_new.js"></script> <script type="text/javascript" src="/static/js/jquery.cookie.js?1743862930"></script> <script src="https://vdse.bdstatic.com//search-video.v1.min.js"></script> <link rel='stylesheet' id='_main-css' href='/static/css/viewer.min.css?2' type='text/css' media='all' /> <script type='text/javascript' src='/static/js/viewer.min.js?1'></script> <script type='text/javascript' src='/static/js/jquery-viewer.min.js'></script> <script type="text/javascript" src="/static/js/global.min.js?5.5.53"></script> <script> var _paq = window._paq = window._paq || []; /* tracker methods like "setCustomDimension" should be called before "trackPageView" */ _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function () { var u = "https://tongji.php.cn/"; _paq.push(['setTrackerUrl', u + 'matomo.php']); _paq.push(['setSiteId', '9']); var d = document, g = d.createElement('script'), s = d.getElementsByTagName('script')[0]; g.async = true; g.src = u + 'matomo.js'; s.parentNode.insertBefore(g, s); })(); </script> <script> // top layui.use(function () { var util = layui.util; util.fixbar({ on: { mouseenter: function (type) { layer.tips(type, this, { tips: 4, fixed: true, }); }, mouseleave: function (type) { layer.closeAll("tips"); }, }, }); }); document.addEventListener("DOMContentLoaded", (event) => { // 定义一个函数来处理滚动链接的点击事件 function setupScrollLink(scrollLinkId, targetElementId) { const scrollLink = document.getElementById(scrollLinkId); const targetElement = document.getElementById(targetElementId); if (scrollLink && targetElement) { scrollLink.addEventListener("click", (e) => { e.preventDefault(); // 阻止默认链接行为 targetElement.scrollIntoView({ behavior: "smooth" }); // 平滑滚动到目标元素 }); } else { console.warn( `Either scroll link with ID '${scrollLinkId}' or target element with ID '${targetElementId}' not found.` ); } } // 使用该函数设置多个滚动链接 setupScrollLink("Article_Details_main1L2s_1", "article_main_title1"); setupScrollLink("Article_Details_main1L2s_2", "article_main_title2"); setupScrollLink("Article_Details_main1L2s_3", "article_main_title3"); setupScrollLink("Article_Details_main1L2s_4", "article_main_title4"); setupScrollLink("Article_Details_main1L2s_5", "article_main_title5"); setupScrollLink("Article_Details_main1L2s_6", "article_main_title6"); // 可以继续添加更多的滚动链接设置 }); window.addEventListener("scroll", function () { var fixedElement = document.getElementById("Article_Details_main1Lmain"); var scrollTop = window.scrollY || document.documentElement.scrollTop; // 兼容不同浏览器 var clientHeight = window.innerHeight || document.documentElement.clientHeight; // 视口高度 var scrollHeight = document.documentElement.scrollHeight; // 页面总高度 // 计算距离底部的距离 var distanceToBottom = scrollHeight - scrollTop - clientHeight; // 当距离底部小于或等于300px时，取消固定定位 if (distanceToBottom <= 980) { fixedElement.classList.remove("Article_Details_main1Lmain"); fixedElement.classList.add("Article_Details_main1Lmain_relative"); } else { // 否则，保持固定定位 fixedElement.classList.remove("Article_Details_main1Lmain_relative"); fixedElement.classList.add("Article_Details_main1Lmain"); } }); </script> </body> </html>