wx.showShareImageMenu（） 点击保存到相册提示暂无权限 如何能在点击保存到相册时获取权限？

代码

wx.canvasToTempFilePath({

canvasId: 'shareCanvas',

x: 0,

y: 0,

width: this.canvasW,

height: this.canvasH,

destWidth: this.canvasW * 2,

destHeight: this.canvasH * 2,

quality: 1.0,

success: (res) => {

// 调起分享菜单

wx.showShareImageMenu({

path: res.tempFilePath,

success: () => {

uni.showToast({

title: '分享入口已打开',

icon: 'success'

});

},

fail: (err) => {

console.error('调起分享菜单失败：', err);

uni.showToast({

title: '如果点击保存相册,请先前往右上角设置打开相册权限',

icon: 'none'

});

},

complete: () => {

this.isLoading = false;

}

});

},

fail: (err) => {

console.error('生成临时图片失败：', err);

uni.showToast({

title: '图片生成失败',

icon: 'none'

});

this.isLoading = false;

}

}, this);

});