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						a0ddf4bdad | 
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			@ -22,33 +22,19 @@ function getWord() {
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function highLight() {
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    if (!isHighlight) return;
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    let articleContent = document.getElementById("article").innerText; //将原来的.innerText改为.innerHtml,使用innerText会把原文章中所包含的<br>标签去除,导致处理后的文章内容失去了原来的格式
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    let articleContent = document.getElementById("article").innerText;
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    let pickedWords = document.getElementById("selected-words");  // words picked to the text area
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    let dictionaryWords = document.getElementById("selected-words2"); // words appearing in the user's new words list
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    let allWords = "";  //初始化allWords的值,避免进入判断后编译器认为allWords未初始化的问题
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    if(dictionaryWords != null){//增加一个判断,检查生词本里面是否为空,如果为空,allWords只添加选中的单词
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        allWords = pickedWords.value + " " + dictionaryWords.value;
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    }
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    else{
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        allWords = pickedWords.value + " ";
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    }
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    const list = allWords.split(" ");//将所有的生词放入一个list中,用于后续处理
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    let allWords = dictionaryWords === null ? pickedWords.value + " " : pickedWords.value + " " + dictionaryWords.value;
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    const list = allWords.split(" "); // 将所有的生词放入一个list中,用于后续处理
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    for (let i = 0; i < list.length; ++i) {
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        list[i] = list[i].replace(/(^\s*)|(\s*$)/g, ""); //消除单词两边的空字符
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        list[i] = list[i].replace('|', "");
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        list[i] = list[i].replace('?', "");
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        if (list[i] !== "" && "<mark>".indexOf(list[i]) === -1 && "</mark>".indexOf(list[i]) === -1) {
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           //将文章中所有出现该单词word的地方改为:"<mark>" + word + "<mark>"。 正则表达式RegExp()中,"\\b"代表单词边界匹配。
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            //修改代码
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            let articleContent_fb = articleContent;  //文章副本
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            while(articleContent_fb.toLowerCase().indexOf(list[i].toLowerCase()) !== -1 && list[i]!=""){
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                //找到副本中和list[i]匹配的第一个单词(第一种匹配情况),并赋值给list[i]。
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                const index = articleContent_fb.toLowerCase().indexOf(list[i].toLowerCase());
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                list[i] = articleContent_fb.substring(index, index + list[i].length);
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                articleContent_fb = articleContent_fb.substring(index + list[i].length);    // 使用副本中list[i]之后的子串替换掉副本
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                articleContent = articleContent.replace(new RegExp("\\b"+list[i]+"\\b","g"),"<mark>" + list[i] + "</mark>");
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        list[i] = list[i].replace(/(^\W*)|(\W*$)/g, ""); // 消除单词两边的非单词字符
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        if (list[i] != "" && "<mark>".indexOf(list[i]) === -1 && "</mark>".indexOf(list[i]) === -1) {
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            // 返回所有匹配单词的集合, 正则表达式RegExp()中, "\b"匹配一个单词的边界, g 表示全局匹配, i 表示对大小写不敏感。
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            let matches = new Set(articleContent.match(new RegExp("\\b" + list[i] + "\\b", "gi")));
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            for (let word of matches) {
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                // 将文章中所有出现该单词word的地方改为:"<mark>" + word + "<mark>"。 
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                articleContent = articleContent.replace(new RegExp("\\b" + word + "\\b", "g"), "<mark>" + word + "</mark>");
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            }
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        }
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    }
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