【报Bug】canvas生成海报问题

示例代码：

<template>  
    <view>  
        <view class="aaaa" @click="addCanvas">点击生成海报</view>  
        <view class="aaaa" @click="saveCanvas">点击保存海报</view>  
        <canvas style="width: 300px; height: 300px;" canvas-id="firstCanvas"></canvas>  
        <image :src="image" v-if="image" width="300" height="300"></image>  
    </view>  
</template>  

<style>  
.aaaa {  
    height: 40px;  
    margin-bottom: 20px;  
    background-color: blue;  
    color: #fff;  
}  
</style>  

<script type="text/javascript">  
export default {  
    data () {  
        return {  
            ctx: null,  
            image: null  
        }  
    },  
    mounted () {  
        this.ctx = uni.createCanvasContext('firstCanvas', this)  
    },  
    methods: {  
        // 读取图片信息  
        setImg (img) {  
            return new Promise ( (resolve, reject) => {  
                uni.getImageInfo({  
                    src: img.url,  
                    success: function(image) {  
                        resolve(image)  
                    },  
                    fail: function(err) {  
                        console.log(err,'获取图片错误')  
                        reject(err)  
                    }  
                });  
            })  
        },  
        addCanvas () {  
            const _this = this;  
            _this.setImg({  
                url: 'https://img.trlpw.com/images/common/2021/10/11/202110116163b74541444.png'  
            }).then ((avatar) => {  
                console.log(avatar)  
                _this.ctx.drawImage(avatar.path, 0, 0, 300, 300)  
                _this.ctx.draw();  
            })  
        },  
        saveCanvas () {  
            const _this = this  
            uni.canvasToTempFilePath({  
                x: 0,  
                y: 0,  
                width: 300,  
                height: 300,  
                destWidth: 300,  
                destHeight: 300,  
                fileType: 'jpg',  
                canvasId: 'firstCanvas',  
                success: function(res) {  
                    console.log(res)  
                    _this.image = res.tempFilePath  
                },  
                fail: function(err) {  
                    uni.showToast({  
                        title: `海报生成失败,${err.errMsg}`,  
                        icon: 'none'  
                    })  
                },  
                complete: function() {  
                    uni.hideLoading();  
                }  
            }, this)  
        }  
    }  
}  
</script>

操作步骤：

同示例代码

预期结果：

微信浏览器内、手机自带浏览器能正常生成图片

实际结果：

实际目前结果微信浏览器内、手机自带浏览器报跨域了