uniapp显示二进制流数据的图片（转base64）

let url = 'data:image/png;base64,' + uni.arrayBufferToBase64(res.data);

<template>
    <view class="invite-code">
        <image class="code" :src="codeSrc" mode="aspectFit"></image>
    </view>
</template>
<script>
    export default {
        data() {
            return{
                codeSrc: ''
            }
        },
        onLoad() {
            this.getCode();
        },
        methods: {
            getCode() {
                const header = {
                    //......,
                    token:this.$store.getters.token||this.$storage.get('token'),
                }
                uni.request({
                    url: this.$api.qqCodePath, //获取图片的URL
                    method: "get",
                    header,
                    responseType: 'arraybuffer', 
                    success: (res) => {//得到的数据是二进制流
                        let url = 'data:image/png;base64,' + uni.arrayBufferToBase64(res.data);
                        this.codeSrc = url;
                    },
                    fail(res) {

                    }
                })
            }
        }
    }
</script>
<style lang="scss" scoped>
    .invite-code{
        width: 100wh;
        height: 100vh;
        display: flex;
        justify-content: center;
        align-items: center;
    }
</style>