vue项目中v-model父子组件通信的实现详解

前言

我们在vue项目中，经常有这样的需求，父组件绑定v-model，子组件输入更改父组件v-model绑定的数值。很多朋友对这种操作不是很清楚，这需要对v-model有比较深入的了解，今天谈谈v-model。

vue的双向数据绑定

v-model这个指令只能用在,这些表单元素上，所谓双向绑定，指的就是我们在js中的vue实例中的data与其渲染的dom元素上的<a href="https://www.jb51.cc/tag/neirong/" target="_blank" class="keywords">内容</a>保持一致，两者无论谁被改变，另一方也会相应的更新为相同的数据。</p> <p>这个问题在很多前端面试中，会提及。面试官问你，vue的双向数据绑定原理是什么？当然，这个也是耳熟能详的问题，<a href="https://www.jb51.cc/tag/baidu/" target="_blank" class="keywords">百度</a>随便一<a href="https://www.jb51.cc/tag/sousuo/" target="_blank" class="keywords">搜索</a>，到处都能找到答案。</p> <p>一般都会<a href="https://www.jb51.cc/tag/sousuo/" target="_blank" class="keywords">搜索</a>到，是用<a rel="external <a href="https://www.jb51.cc/tag/nofollow/" target="_blank" class="keywords">nofollow</a>" target="_blank" href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty">Object.defineProperty( )</a> ，来监听数据get和set，来实现数据劫持的。</p> <p>假如对Object.defineProperty( )不是很了解，可以点击上面<a href="https://www.jb51.cc/tag/lianjie/" target="_blank" class="keywords">链接</a>，看看其语法！</p> <p><h3>举个简单的例子：</h3></p> <div class="jb51code"> <pre class="brush:js;"> var blog = { name: 'haorooms<a href="https://www.jb51.cc/tag/boke/" target="_blank" class="keywords">博客</a>' }; console.log(blog.name); // haorooms<a href="https://www.jb51.cc/tag/boke/" target="_blank" class="keywords">博客</a></pre> </div> <p>如果想要在执行<code>console.log(blog.name)</code>的同时，直接给haorooms<a href="https://www.jb51.cc/tag/boke/" target="_blank" class="keywords">博客</a>加个书名号，那要怎么处理呢？或者说要通过什么监听对象 blog的<a href="https://www.jb51.cc/tag/shuxing/" target="_blank" class="keywords">属性</a>值。这时候<code>Object.defineProperty( )</code>就派上用场了，<a href="https://www.jb51.cc/tag/daima/" target="_blank" class="keywords">代码</a>如下：</p> <div class="jb51code"> <pre class="brush:js;"> var blog= {} var name = ''; Object.defineProperty(blog,'name',{ set: function (value) { name = value; console.log('欢迎来到' + value); },get: function () { return '《' + name + '》' } }) blog.name = 'haorooms<a href="https://www.jb51.cc/tag/boke/" target="_blank" class="keywords">博客</a>'; // 欢迎来到haorooms<a href="https://www.jb51.cc/tag/boke/" target="_blank" class="keywords">博客</a> console.log(blog.name); // 《haorooms<a href="https://www.jb51.cc/tag/boke/" target="_blank" class="keywords">博客</a>》</pre> </div> <p>上面<a href="https://www.jb51.cc/tag/daima/" target="_blank" class="keywords">代码</a>执行一下，可以查看<a href="https://www.jb51.cc/tag/xiaoguo/" target="_blank" class="keywords">效果</a>！</p> <p>关于 vue的双向数据绑定，具体如何实现的？网上也有很多实现的<a href="https://www.jb51.cc/tag/daima/" target="_blank" class="keywords">代码</a>，这里就不多累赘了！</p> <p><h3>v-model 的使用</h3> </p> <p>上面开了一个小差，讲了那么多，其实就是为了说明Vue 是单项数据流，v-model 只是语法糖而已。</p> <div class="jb51code"> <pre class="brush:xhtml;"> <input v-model="haorooms" /> <input v-bind:value="haorooms" v-on:input="haorooms= $event.target.value" /></pre> </div> <p>第一行的<a href="https://www.jb51.cc/tag/daima/" target="_blank" class="keywords">代码</a>其实只是第二行的语法糖。然后第二行<a href="https://www.jb51.cc/tag/daima/" target="_blank" class="keywords">代码</a>还能简写成这样：</p> <div class="jb51code"> <pre class="brush:xhtml;"> <input :value="haorooms" @input="haorooms= $event.target.value" /></pre> </div> <p>也就是说，</p> <div class="jb51code"> <pre class="brush:xhtml;"> <input v-model="haorooms" /></pre> </div> <p>也可以写成</p> <div class="jb51code"> <pre class="brush:xhtml;"> <input :value="haorooms" @input="haorooms= $event.target.value" /></pre> </div> <p><h3>v-model在组件上的使用</h3></p> <p>回到我们一开始的疑问了？vue中v-model如何进行父子组件的通信？如何在组件中使用呢？假如你理解了我上面的例子，那么，我们就可以很简单的在组件中使用v-model了。</p> <p>父组件<a href="https://www.jb51.cc/tag/daima/" target="_blank" class="keywords">代码</a>如下：</p> <div class="jb51code"> <pre class="brush:xhtml;"> <template> <div id="demo"> <test-model v-model="haorooms"></test-model> <span>{{haorooms}}</span> </div> </template> <script> import testModel from 'src/components/testModel' export default { data(){ return{ haorooms: "haorooms" } },components: { testModel,} } </script> <style lang="scss" scoped> </style></pre> </div> <p>子组件<a href="https://www.jb51.cc/tag/daima/" target="_blank" class="keywords">代码</a>如下：</p> <div class="jb51code"> <pre class="brush:xhtml;"> <template> <span> <input ref="input" :value="value" @input="$emit('balabala',$event.target.value)" > </span> </template> <script> export default { data(){ return{ } },props: ["value"],model: { prop: 'value',event: 'balabala' } } </script> <style lang="scss" scoped> </style></pre> </div> <p>我们可以通过上面<a href="https://www.jb51.cc/tag/daima/" target="_blank" class="keywords">代码</a>，子组件<a href="https://www.jb51.cc/tag/xiugai/" target="_blank" class="keywords">修改</a>父组件v-model绑定的值！</p> <p>实现截图如下：</p> <p style="text-align: center"><p class="pic_center"><img src="https://files.jb51.cc/file_images/article/201712/20171210101723550.gif?20171110101735" alt="" /></p></p> <p><h3>v-model 的缺点和<a href="https://www.jb51.cc/tag/jiejue/" target="_blank" class="keywords">解决</a>办法</h3> </p> <p>在创建类似复选框或者单选框的常见组件时，v-model就不好用了。</p> <div class="jb51code"> <pre class="brush:xhtml;"> <input type="checkbox" v-model="haorooms" /></pre> </div> <p>我们可以用如下方式<a href="https://www.jb51.cc/tag/jiejue/" target="_blank" class="keywords">解决</a>：</p> <div class="jb51code"> <pre class="brush:xhtml;"> <input type="checkbox" :checked="status" @change="status = $event.target.checked" /></pre> </div> <p>父组件可以如下写：</p> <div class="jb51code"> <pre class="brush:xhtml;"> <my-check<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a> v-model="haorooms"></my-checkbox></pre> </div> <p>子组件：</p> <div class="jb51code"> <pre class="brush:xhtml;"> <input type="check<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>"  @change="$emit('balabala',$event.target.checked)" :checked="value" /> export default { data(){ return{ } },props: ['checked'],//这里就不用 value 了，而是 checked model: { prop: 'checked',event: 'balabala' },}</pre> </div> <p>关于vue的v-model就写到这里。</p> <p><h3>总结</h3></p> <p>以上就是这篇<a href="https://www.jb51.cc/tag/wenzhang/" target="_blank" class="keywords">文章</a>的全部<a href="https://www.jb51.cc/tag/neirong/" target="_blank" class="keywords">内容</a>了，希望本文的<a href="https://www.jb51.cc/tag/neirong/" target="_blank" class="keywords">内容</a>对大家的学习或者工作具有一定的参考学习价值，如果有疑问大家可以留言交流，谢谢大家对编程之家的<a href="https://www.jb51.cc/tag/zhichi/" target="_blank" class="keywords">支持</a>。</p><i class="glyphicon glyphicon-link"></i> 原文链接：https://www.f2er.com/vue/34793.html</div> <div class="topcard-tags"><a href="https://www.f2er.com/tag/model/" class="tag_link" target="_blank">model</a><a href="https://www.f2er.com/tag/modelp/" class="tag_link" target="_blank">model</a><a href="https://www.f2er.com/tag/pmodel/" class="tag_link" target="_blank">model</a><a href="https://www.f2er.com/tag/vue/" class="tag_link" target="_blank">vue</a><a href="https://www.f2er.com/tag/pvue/" class="tag_link" target="_blank">vue</a><a href="https://www.f2er.com/tag/vuep/" class="tag_link" target="_blank">vue</a><a href="https://www.f2er.com/tag/vue2/" class="tag_link" target="_blank">vue2</a><a 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