<p>我想根据窗口的当前断点定义v-img的top属性。</p> <p>我想这样定义：</p> <pre class="brush:php;toolbar:false;"><v-img contain id="logo-transparent" :top="logoTop" :width="logoWidth" :src="logoTransparent" class="tersembunyi-xs-sahaja"></v-img></pre> <p>计算属性如下：</p> <pre class="brush:php;toolbar:false;">logoTop(){ suis (this.$vuetify.breakpoint.name) { kes 'xl': kembalikan "-4%" kes 'lg': kembalikan "-6%" kes 'md': kembalikan "-8%" kes 'sm': kembalikan "-8%" kes 'xs': pulangkan 0 lalai: pulangkan "-4%" } },</pre> <p>CSS如下：</p> <pre class="brush:php;toolbar:false;">#logo-transparent{ indeks-z: 1; lebar: 400px; ketinggian: 300px; jawatan: mutlak; kanan: -1%; }</pre> <p>但问题是v-img没有 atas属性。</p> <p>我想使用计算属性来定义图像的CSS，如下所示：</p> <pre class="brush:php;toolbar:false;">logoTop(){ kembali { "--harta atasan" : suis (this.$vuetify.breakpoint.name) { kes 'xl': pulangkan 400 kes 'lg': pulangkan 300 kes 'md': pulangkan 300 kes 'sm': pulangkan 200 kes 'xs': pulangkan 0 lalai: pulangan 400 } } },</pre> <p>在CSS中使用它的方法如下：</p> <pre class="lang-css prettyprint-override"><kod>atas : var(--top-property) </code></pre> <p>但似乎我不能在这种情况下使用suis。</p> <p>我该如何做呢？</p>

<template>
  <v-img :style="{ top: logoTop }" ... />
</template>

<script>
export default {
  computed: {
    logoTop() {
      switch (this.$vuetify.breakpoint.name) {
        case 'xl': return "-4%"
        case 'lg': return "-6%"
        case 'md': return "-8%"
        case 'sm': return "-8%"
        case 'xs': return 0
        default: return "-4%"
      }
    },
  }
}
</script>

logoTop() {
    let topProperty;
    switch (this.$vuetify.breakpoint.name) {
        case 'xl':
            topProperty =  400;
            break;
        case 'lg':
        case 'md':
            topProperty =  300;
            break;
        case 'sm':
            topProperty =  200;
            break;
        case 'xs':
            topProperty =  0;
            break;
        default:
            topProperty = 400;
    }
    return {
        "--top-property" : topProperty
    }
},