vue实现图片按比例缩放问题操作

getImg(src){
 var img_url =src
 var img = new Image()
 img.src=img_url
 this.pictureHeight.height = Math.ceil(img.height/img.width * 460)+'px'
},
//首先通过这个方法算出图片的高度/宽度比，460是我设置的宽度，计算得出需要的高度，然后修改容器的高
//度，图片通过height:100%;width:100%撑开，这样图片就不会失真了

  this.$nextTick(function(){
  // this.$refs.test.$el.childNodes[0].style.height=this.pictureHeight.height
   document.getElementsByClassName('el-carousel__container')[0].style.height=this.pictureHeight.height
  })
 
//现在就是通过这两种比较通用的js方式来操作属性了

// 实现图片点击放大
import Viewer from 'v-viewer'
import 'viewerjs/dist/viewer.css'
Vue.use(Viewer);
Viewer.setDefaults({
 Options: { "inline": true, "button": true, "navbar": true, "title": true, "toolbar": true, "tooltip": true, "movable": true, "zoomable": true, "rotatable": true, "scalable": true, "transition": true, "fullscreen": true, "keyboard": true, "url": "data-source" }
});

<template>
  <!-- imgArr是图片地址的数组，例： ['1.png','2.png'] -->
 <viewer :images="imgArr">
 <img v-for="src in imgArr" :src="src" :key="src" width="200">
 </viewer>
</template>

import VueDirectiveImagePreviewer from 'vue-directive-image-previewer'
import 'vue-directive-image-previewer/dist/assets/style.css'
Vue.use(VueDirectiveImagePreviewer)

<template>
 <div>
  <img v-image-preview src="123.png"/>
 </div>
</template>