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通过style.zoom按比例缩放即可，我在项目里实现了。
<div :style="previewStyle"> <div :style="previews.div"> <img :src="previews.url" :style="previews.img"> </div> </div>
在js里面：
computed: { previewStyle() { var previews = this.previews var cropperHeight = this.cropperHeight return { width: previews.w + 'px', height: previews.h + 'px', overflow: 'hidden', margin: 'auto', zoom: this.isLandscape ? this.previewWidth / previews.w : cropperHeight / previews.h } } }