How to remove html from js

<p>JavaScript is a high-level programming language that was originally created to improve user interaction with web pages. In web pages, HTML is the basic language, which is used to define the markup and content inside the web page, and JavaScript is used to control these marks and content. </p> <p>But sometimes we need to remove HTML tags and obtain plain text, such as crawling on the website, calculating text length, etc. At this time, we can use JavaScript to remove HTML tags. </p> <p>In this article, we will introduce how to use JavaScript to remove HTML tags, and we will also provide some common methods and techniques. </p> <p>1. Use regular expressions to remove HTML tags</p> <p>Using regular expressions in JavaScript is a common method. We can use regular expressions to remove HTML tags. Here is a basic example: </p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">function stripHtml(html) {     return html.replace(/<[^>]+>/g,''); }</pre><div class="contentsignin">Copy after login</div></div> <p>In this function, we use the regular expression <code>/<[^>] >/g</code> to remove all HTML tags. The meaning of this regular expression is: "match everything starting with <code><</code>, ending with <code>></code>, and there is no <code><</code> or <code>> in the middle </code> character string". </p> <p>2. Use a third-party library to remove HTML tags</p> <p> Another method is to use a third-party library. For example, in Node.js, we can use the Cheerio library to remove HTML tags. It provides a jQuery-like syntax for manipulating HTML documents, including the ability to remove HTML tags. </p> <p>The following is an example of using Cheerio to remove HTML tags: </p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">const cheerio = require('cheerio'); function stripHtml(html) {     const $ = cheerio.load(html);     return $.text(); }</pre><div class="contentsignin">Copy after login</div></div> <p>This function uses the <code>cheerio.load</code> method to load the HTML document and uses <code>$.text </code>Method to get plain text. Cheerio is very convenient and it also provides various selectors, similar to jQuery. </p> <p>3. Traverse document nodes to remove HTML tags</p> <p>In our web pages, HTML documents usually contain many nodes (nodes are elements in web pages, such as tags, text nodes, etc.). JavaScript can use the DOM (Document Object Model) to manipulate these nodes. </p> <p>We can traverse these nodes, remove nodes containing HTML tags, and finally get plain text. Here's an example: </p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">function stripHtml(html) {     const element = document.createElement('div');     element.innerHTML = html;     const nodes = element.childNodes;     let result = '';     for(let i = 0; i < nodes.length; i++) { if(nodes[i].nodeType === 3) { result += nodes[i].textContent; } } return result; }</pre><div class="contentsignin">Copy after login</div></div><p>This function creates a dummy <code><div> element and inserts HTML text into it. It then iterates through all child nodes using the <code>childNodes</code> attribute and checks whether each node is a text node (i.e. the <code>nodeType</code> attribute is 3). If it is a text node, the text content is added to the result. <p>4. Summary</p><p>JavaScript is a very powerful programming language that can be used to operate various elements in HTML documents. In this article, we introduced three methods for removing HTML tags: regular expressions, third-party libraries, and traversing document nodes. </p><p> Each of these methods has its own advantages and disadvantages. We can choose the method that suits us best according to the actual situation. Removing HTML tags is a common requirement in web development. I hope the method introduced in this article can be helpful to everyone. </p></pre>

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