为啥 背景音频调起播放 ，会监听到多次

    onLoad() {  
        this.$backgroundAudio.title = '致爱丽丝';  
        this.$backgroundAudio.singer = '暂无';  
        this.$backgroundAudio.coverImgUrl = 'https://qiniu-web-assets.dcloud.net.cn/unidoc/zh/music-a.png';  
        this.$backgroundAudio.src = 'https://bjetxgzv.cdn.bspapp.com/VKCEYUGU-hello-uniapp/2cc220e0-c27a-11ea-9dfb-6da8e309e0d8.mp3';  
        this.$backgroundAudio.play();  
        this.$backgroundAudio.onPlay(() => {  
            console.log('开始播放===');  
        });  
        this.$backgroundAudio.onPause(() => {  
            console.log('停止===');  
        });  
    },  
    onBackPress(event) {  
        this.$backgroundAudio.stop();  
        console.log('退出页面停止播放===');  
    },