uniapp 预览图片

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preImg(index){
	let urls = []
   this.images.map((item,i) => {
			if(index==i){
				urls.unshift(item.file_path)
			}else{
			 urls.push(item.file_path)
			 }
		  })
	uni.previewImage({
		urls
		})
	}