vue v-model实现原理(V-model的使用和原理)

在我们开发中，表单控件在实际开发中是非常常见的，特别是对于用户信息的提交，需要大量的表单。特别是注册页面和登录页面等等，我们需要获取用户输入的信息。

在使用Vue的时候，假如我们想获取用户输入的数据，我们可以使用v-model指令来实现表单元素和数据的双向绑定。

什么是双向绑定呢？请看简单的示例代码

运行效果：

以上代码看似只是一个普通的数据绑定，但当我们使用v-model指令来绑定属性值的时候，我们修改标签里面的值时，我们观察message属性的值也会跟着变化。假如我们在标签里面把“Hello World”修改成“Hello Vue”

我们可以看见标签也发生了变化。由此可见message属性的值已经绑定标签里面，当我们修改里面的值时,message属性的值也会跟随着改变。

那么v-model的原理是怎样的呢？

v-bind:value="message" 我们可以获取message属性的值然后绑定到标签里面。

v-on:input="message=$event.target.value"

我们先来看看标签的input事件

oninput 事件在用户输入时触发，它是在元素值发生变化时立即触发；

该事件在 或 元素的值发生改变时触发。</p> <p></p> <p>所以v-model其实是一个语法糖，它背后包含两个操作</p> <p>1.v-bind:value 绑定一个value属性</p> <p>2.v-on指令给当前元素绑定input事件</p> <div> <a href="https://?bstudy" rel="nofollow noopener" target="_blank"><strong></strong></a></p> <p><a rel="author" style="display:none" href="https://hooper.eu.org/?vue/752.html">https://hooper.eu.org/vue/752.html</a> </div> </div> </div> <div class="post-end-tools"> <div class="post-copyright"> 版权声明：<br> 作者：Joker 链接：<a href="https://456787.xyz/archives/722">https://456787.xyz/archives/722</a><br> 文章版权归作者所有，转载请注明出处。 </div> <div class="post-end-dividing"> THE END </div> <div class="post-tags"> </div> <div class="post-end-tool-btns"> <div class="post-share-btn post-end-tool-btn-item" onclick="showplane('.post-share-btn','#share-plane',event)"> <svg class="icon" viewBox="0 0 1024 1024"> <path d="M793.472 102.208c-70.592 0-128 57.408-128 128 0 7.744 0.96 15.232 2.304 22.656L273.6 422.976C250.368 399.04 217.92 384 181.952 384c-70.592 0-128 57.408-128 128 0 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