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javascript - VueJS更改特定行的字体而不是所有行

问题描述

当前代码更改所有行与特定行的字体：

Vue.component('blog-post', {
  props: ['post'],
  template: `
    <div class="blog-post row">
      <h3 class="cell"> {{ post.title }}</h3>
      <button @click="$emit('enlarge-text')">Enlarge text</button>
      <div v-html="post.content" class="cell"></div>
    </div>
  `,
});

new Vue({
  el   : '#blog-post-demo',
  data : {
    posts : [
      {id: 1, title : 'My Journey to Africa',    content : 'I am the post'},
      {id: 2, title : 'My Journey to America',   content : 'I am the post'},
      {id: 3, title : 'My Journey to Antartica', content : 'I am the post'},
      {id: 4, title : 'My Journey to Asia',      content : 'I am the post'},
    ],
    postFontSize : 1,
  }
});
.row {
  background-color: cyan;
}

.cell {
  background-color: antiquewhite;
}
<script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.min.js"></script>

<div id="blog-post-demo">
  <blog-post v-for="post in posts" :post="post" :key="post.id" :style="{fontSize : postFontSize + 'em'}" @enlarge-text="postFontSize += 0.1"></blog-post>
</div>

我怎样才能操作特定的一行，一行，更新一行的字体大小与所有行？

尝试了以下但没有奏效：

Vue.component('blog-post', {
  props: ['post'],
  template: `
    <div class="blog-post row" :style="{fontSize : postFontSize + 'em'}" @enlarge-text="postFontSize += 0.1">
      <h3 class="cell">{{ post.title }}</h3>
      <button @click="$emit('enlarge-text')">Enlarge text</button>
      <div v-html="post.content" class="cell"></div>
    </div>
  `,
});

new Vue({
  el   : '#blog-post-demo',
  data : {
    posts : [
      {id: 1, title : 'My Journey to Africa',    content : 'I am the post'},
      {id: 2, title : 'My Journey to America',   content : 'I am the post'},
      {id: 3, title : 'My Journey to Antartica', content : 'I am the post'},
      {id: 4, title : 'My Journey to Asia',      content : 'I am the post'},
    ],
    postFontSize : 1,
  }
})
.row {
  background-color: cyan;
}

.cell {
  background-color: antiquewhite;
}
<script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.min.js"></script>

<div id="blog-post-demo">
  <blog-post v-for="post in posts" :post="post" :key="post.id"></blog-post>
</div>

标签： javascriptvue.jsvuejs2

解决方案

如果只想更新 1 行，postFontSize应该是blog-post组件的本地数据

<!DOCTYPE html>
<html>
<head>
  <title>My first Vue app</title>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
  <style>
    .row {
      background-color: cyan;
    }

    .cell {
      background-color: antiquewhite;
    }
  </style>
</head>
<body>
    <div id="blog-post-demo">
      <blog-post v-for="post in posts" :post="post" :key="post.id"></blog-post>
    </div>
  <script>
    
Vue.component('blog-post', {
  props: ['post'],
  template: `
    <div class="blog-post row" :style="{fontSize : postFontSize + 'em'}">
      <h3 class="cell"> {{ post.title }}</h3>
      <button @click="postFontSize += 0.1">Enlarge text</button>
      <div v-html="post.content" class="cell"></div>
    </div>`,
  data() {
     return {
          postFontSize : 1
     }
  }
})
new Vue({
  el   : '#blog-post-demo',
  data : {
    posts : [
      {id: 1, title : 'My Journey to Africa',    content : 'I am the post'},
      {id: 2, title : 'My Journey to America',   content : 'I am the post'},
      {id: 3, title : 'My Journey to Antartica', content : 'I am the post'},
      {id: 4, title : 'My Journey to Asia',      content : 'I am the post'},
    ]
  }
})
  </script>
</body>
</html>

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