var isRead = true;
var isChoose = true;
const reader = window.speechSynthesis; // 全局定义朗读者，以便朗读和暂停
//获取字符
function getWord(){
   return window.getSelection?window.getSelection():document.selection.createRange().text;
}
//填充字符
function fillingWord(){
   let word = getWord();
   if (isRead) read(word);
   if (!isChoose) return;
   let element = document.getElementById("selected-words");
   element.value = element.value + " " + word;
}
document.getElementById("text-content").addEventListener("click", fillingWord, false);
//朗读单词
//@word 要朗读的单词
function read(word){
   //关闭当前正在读的单词
   reader.cancel()
   //创建新的朗读任务
   let msg = new SpeechSynthesisUtterance(word);
   reader.speak(msg);
}
//关闭正在读的单词
function onReadClick(){
    let isRead = !isRead;
    if(!isRead){
       reader.cancel();
    }
}
//取消当前选择
function onChooseClick(){
    isChoose = !isChoose;
}