（文字转语音）如何能够实现语音播报完成之后结束呢？？

    var newUrl = [];
    var url = "http://tts.baidu.com/text2audio?lan=zh&ie=UTF-8&spd=3&text=" + encodeURI(str);
    console.log("url:" + url);
    newUrl.push(url);
    console.log("audioUrl-111:" + JSON.stringify(newUrl));
    this.audio.src = "";
    this.audio.onloadstart = () =>{
        // console.log("tts start:" + url);
        console.log("tts start:" + newUrl);
    };
    this.audio.addEventListener('ended',() =>{
        for(let i = 0;i < newUrl.length; i++){
            if(newUrl.length === 1){
                this.audio.src = newUrl[0];
                // console.log("时长:" + this.audio.duration);
                // this.audio.src = "";
            }else {
                this.audio.src = newUrl[i];
            }
        }
        this.audio.src = "";
    },false);
    this.audio.autoplay = true;
    // this.audio.pause();
    this.audio.load();

我想请问下我上面这个代码需要怎么修改，才能满足语音的src地址改变，播报完语音后，结束播放呢
注：数据是多条的，不是单条