iot-test-app/components/upload-photo/upload-photo.vue

<template>
	<view class="">

	

	</view>

</template>

<script>
	import api from "@/utils/api.js"
	export default {
		data() {
			return {
			
			}
		},
		methods: {
		

		},
		urlTobase64(url) {
		                wx.request({
		                    url: url,
		                    responseType: 'arraybuffer', //最关键的参数，设置返回的数据格式为arraybuffer
		                    success: res => {
		                        //把arraybuffer转成base64
		                        let base64 = wx.arrayBufferToBase64(res.data);
		
		                        //不加上这串字符，在页面无法显示的哦
		                        base64 = 'data:image/jpeg;base64,' + base64
		                        this.lineBg = base64
		                        //打印出base64字符串，可复制到网页校验一下是否是你选择的原图片呢
		                        console.log('base64=>', base64)
		                    }
		                })
		            }
	

	}
</script>