How to use props in vue

<blockquote><p>In Vue, props are used to pass data between components. Declare the props received by the child component in the parent component, use the props option in the child component to receive it, and use :prop-name="data" to pass data. Vue allows you to specify prop types to ensure the correctness of passed data, and you can use the default option to specify default values. The watch option can be used to monitor prop changes. Leverage props to facilitate communication and reuse between components. </p></blockquote> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/202405/02/2024050221213431472.jpg" class="lazy" alt="How to use props in vue" ></p> <p><strong>Usage of Props in Vue</strong></p> <p>#Props in Vue are used to pass data between components, which allows Child components receive data passed from parent components. The following is the usage of props: </p> <p><strong>1. Declare props in the parent component</strong></p> <p>In the parent component, use the <code>props</code> option to declare the child component. Received props: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>export default { props: ['propName'] }</pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div><p><strong>2. Use props in the child component</strong></p><p>In the child component, receive it from the parent component through the <code>props</code> option data: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>export default { props: ['propName'] }</pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div><p><strong>3. Pass props data</strong></p><p>In the parent component, use the <code><</code> tag to pass data to the child component:</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><child-component :prop-name="data"></child-component></pre><div class="contentsignin">Copy after login</div></div><p>Among them, <code>:prop-name</code> is the name of the prop, and <code>data</code> is the data to be passed. </p><p><strong>4. Prop type</strong></p><p>Vue allows you to specify types for props to ensure that the data type passed is correct. Types can use any basic JavaScript type (e.g. string, number, boolean) or a custom type. </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>export default { props: { propName: { type: String, required: true } } }</pre><div class="contentsignin">Copy after login</div></div><p><strong>5. Default value</strong></p><p>If prop is not provided, you can use the <code>default</code> option to specify a default value: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>export default { props: { propName: { default: 'default value' } } }</pre><div class="contentsignin">Copy after login</div></div><p> <strong>6. Monitor prop</strong></p><p>When prop is updated, you can use the <code>watch</code> option to monitor prop changes: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>export default { props: ['propName'], watch: { propName(newValue, oldValue) { // prop 更新时的操作 } } }</pre><div class="contentsignin">Copy after login</div></div><p>By using props, you can easily Pass data between Vue components efficiently, promoting communication and reuse between components. </p>

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