// 设置语音播报对象
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var Voice = function() {
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this.speak = window.speechSynthesis;
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this.tospeak = new SpeechSynthesisUtterance('');
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this.voice = '';
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this.zh_CN = false;
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this.rate = 1.5;
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this._setLang(); // 获取并检测是否有中文的环境
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this.timeInterval = 27; //循环间隔(秒)
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this.speak_enable = true; //ture:开启语音播报 false:停止语音播报
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};
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// 播报语音 (调用发声的方法时请使用延时发声)
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Voice.prototype.play = function(txt,callback) {
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if(!this.zh_CN) {
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console.info('你的电脑不支持中文播报！');
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}
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_timeInterval = this.timeInterval;
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//console.info(this.speak_enable);
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if(!this.speak_enable){ //识别是否开启声音播报
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if(callback && typeof callback == 'function'){
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setTimeout(function(){
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callback();
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}, Math.abs(_timeInterval)*1000);
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}
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return;
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}
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this.cancel();
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this.tospeak.text = txt;
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this.tospeak.voice = this.voice; // 设定中文播报
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this.tospeak.rate = this.rate;
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//console.info(to_speak);
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var starttime = new Date();
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this.speak.speak(this.tospeak);
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//console.info(this.tospeak);
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this.tospeak.onend = function(event) {
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//console.info("播放结束");
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if(callback && typeof callback == 'function'){
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var endtime = new Date();
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var timelong = (endtime.getTime()-starttime.getTime())/1000;
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//console.info(parseInt(_timeInterval)+"==="+parseInt(timelong));
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if(timelong > this.timeInterval){
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callback();
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}else{
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setTimeout(function(){
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callback();
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}, Math.abs(_timeInterval-timelong)*1000);
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}
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}
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};
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};
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// 退出当前播报
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Voice.prototype.cancel = function() {
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this.speak.cancel();
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};
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//停止语音播报
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Voice.prototype.stopSpeak = function() {
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this.speak.cancel();
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this.speak_enable = false;
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};
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// 检查当前语言环境
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Voice.prototype._setLang = function() {
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var _this = this;
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setTimeout(function(){
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var voices = _this.speak.getVoices();
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for(var i=0; i<voices.length; i++) {
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var _voices = voices[0];
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//console.info(_voices);
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if(_voices.lang === 'zh-CN') {
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_this.zh_CN = true;
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_this.voice = _voices;
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}
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}
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}, 0);
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};
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var voice = new Voice();
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voice.cancel();
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