页面

<view @tap="uploadImg">
    <image v-if="imgSrc" :src="imgSrc"></image>
    <view  v-if="!imgSrc">点击上传</view>
</view>

方法

uploadImg(){
    uni.chooseImage({
        count: 1, //默认9
        sizeType: ['compressed'], //可以指定是原图还是压缩图，默认二者都有
        sourceType: ['album'], //从相册选择
        success:res => {
            this.imgSrc = res.tempFilePaths[0]
            //上传给后台
            uni.uploadFile({
                url:'图片上传接口',
                filePath: res.tempFilePaths[0],
                header: {
                    'Authorization': "Bearer " + uni.getStorageSync('token')
                },
                success: (uploadFileRes) => {
                    var that = this
                    let obj = eval("("+uploadFileRes.data+")")
                    that.img = obj.data
                }
            })
        }	
    });
},