uniapp 之 base64转临时地址播放mp3

需求是：进入页面的时候是先有背景音乐，发送问题请求回答的时候会返回文字和音频，前端要把音频读出来，并且把背景音乐停止，读完音频后再打开背景音乐

一开始用的直接base64直接拼接在地址后 真机放不了

const innerAudioContext = wx.createInnerAudioContext();
innerAudioContext.src ='data:audio/mp3;base64,'+ 请求获取的base64编码的mp3格式文件;
innerAudioContext.play();

下面这个方式亲测有效

//背景音乐
			playBackground(innerAudioContext, stop) {
				// const innerAudioContext = uni.createInnerAudioContext();
				innerAudioContext.autoplay = true;
				innerAudioContext.loop = true; //循环播放
				innerAudioContext.src = 'https://wealthgod.oss-cn-beijing.aliyuncs.com/caishen/backgroundmq3.mp3';
				innerAudioContext.onPlay(() => {
					console.log('开始播放');
				});
				innerAudioContext.onStop((res) => {
					innerAudioContext.stop()
					//播放停止，销毁该实例
					innerAudioContext.destroy()

				});
				innerAudioContext.onEnded((res) => {
					innerAudioContext.play();
				});
			},
//回答音频			
playerAnswer(url) {
				const backgroundAudioManager = wx.getBackgroundAudioManager()
				var number = Math.random()
				const audioPath = wx.env.USER_DATA_PATH + '/new' + number + '.mp3'
				const fs = wx.getFileSystemManager();
				fs.writeFile({
					filePath: audioPath,
					data: url,
					encoding: 'base64',
					success(res) {
						backgroundAudioManager.title = '财神'
						backgroundAudioManager.src = audioPath
						backgroundAudioManager.onEnded((res) => {
							backgroundAudioManager.src = 'https://wealthgod.oss-cn-beijing.aliyuncs.com/caishen/backgroundmq3.mp3';
						});
					},
				})
			},
			this.playBackground(uni.createInnerAudioContext())
			this.playerAnswer(surl)//surl是背景地址
			

//manifest.json中
 /* 小程序特有相关 */
    "mp-weixin" : {     
        "requiredBackgroundModes" : [ "audio" ],
    },