父组件如何覆盖子组件样式

Question

父组件 about.vue

<template>
  <div id="wrap">
    <header-menu></header-menu>
    <banner-text :banner="about_banner_src" :content_text="content_text"></banner-text>
    <footer-menu></footer-menu>
  </div>
</template>
<script>
  import headerMenu from '../components/Header'
  import bannerText from '../components/Banner'
  import footerMenu from '../components/Footer'
  export default {
    data() {
      return {
        about_banner_src: '../../static/img/banner4.png',
        // title_text:'',
        content_text: '我是banner解说文字'
      }
    },
    components: {
      headerMenu,
      bannerText,
      footerMenu
    }
  }

</script>
<style lang="css">
  .banner .banner-text {
    width: 1024px;
    margin-left: -512px;
  }

  .banner .banner-text .content-text {
    margin-top: -35px;
  }

  @media screen and (max-width:1200px) and (min-width:800px) {
    .banner .banner-text {
      width: 750px;
      margin-left: -375px;
    }

    .banner .banner-text .content-text {
      margin-top: -20px;
    }
  }

</style>

子组件 banner.vue

<template>
  <div class="banner">
    <img :src="banner" alt="banner图">
    <div class="banner-text">
      <h3 class="title-text" v-if="title_text">{{title_text}}</h3>
      <p class="content-text" v-html="content_text"></p>
    </div>
  </div>
</template>
<script>
  export default {
    name: 'Banner',
    data() {
      return {

      }
    },
    props: {
      banner: {
        type: String,
        required: true
      },
      title_text: String,
      content_text: String
    }
  }

</script>
<style lang="css">
  /* banner图 */
  .banner {
    position: relative;
    font-size: 0;
  }

  .banner img {
    width: 100%;
  }

  /* banner+文字 */
  .banner .banner-text {
    position: absolute;
    width: 800px;
    height: 100%;
    top: 0;
    left: 50%;
    margin-left: -400px;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .banner .banner-text .title-text {
    font-size: 30px;
    color: #ffffff;
    text-align: center;
    /* margin-top: 180px; */
  }

  .banner .banner-text .content-text {
    font-size: 16px;
    color: #ffffff;
    /* text-align: center; */
    margin-top: 90px;
    line-height: 28px;
  }

</style>

Answer 1

你也没有写scoped ,增加权重就行了呀 .wrap .banner .contentext{}