diff --git a/app/static/js/highlight.js b/app/static/js/highlight.js
index 9646ff3..4552e9d 100644
--- a/app/static/js/highlight.js
+++ b/app/static/js/highlight.js
@@ -15,6 +15,42 @@ function showBtnHandler() {
     document.getElementById("text-content").addEventListener("touchstart", fillInWord, false);
     highLight();
 }
+function replaceWords(str, word) {
+  let count = 0;
+
+  const regex = new RegExp(`(^|\\s)${word}(?=\\s|$)`, 'g');
+
+  let result = str.replace(regex, (match, p1) => {
+    count++;
+    // p1 保留前导空格（如果有），仅第一个匹配保留，后续匹配替换为空字符串
+    return count === 1 ? match : p1;
+  });
+
+  return result;
+}
+
+function countWords(str, word) {
+  // 使用正则表达式匹配目标单词的整个单词边界情况，包括前后空格、行首和行尾
+  const regex = new RegExp(`(^|\\s)${word}(?=\\s|$)`, 'g');
+  let match;
+  let count = 0;
+
+  // 迭代匹配所有符合条件的单词
+  while ((match = regex.exec(str)) !== null) {
+    count++;
+  }
+
+  return count;
+}
+//用于替换单词
+function replaceAllWords(str, word, replacement) {
+  const regex = new RegExp(`(^|\\s)${word}(?=\\s|$)`, 'gi');
+  let result = str.replace(regex, (match, p1) => {
+    return p1 + replacement;
+  });
+
+  return result;
+}
 
 function getWord() {
     return window.getSelection ? window.getSelection() : document.selection.createRange().text;
@@ -33,8 +69,22 @@ function highLight() {
     if(word !== null && word !== "" && word !== " "){
         let articleContent_fb2 = articleContent;
         if(localStorage.getItem("nowWords").indexOf(word) !== -1 || localStorage.getItem("nowWords").indexOf(word.toLowerCase()) !== -1){
-            articleContent = articleContent.replace(new RegExp('<span class="highlighted">' + word + '</span>', "gi"), word);
-            pickedWords.value = localStorage.getItem("nowWords").replace(word,"");
+            articleContent = articleContent.replace(new RegExp('<span class="highlighted">' + word + '</span>', "g"), word);
+
+    let count=countWords(pickedWords.value,word)
+    let currentWords=localStorage.getItem("nowWords")+" "+word
+    localStorage.setItem("nowWords",currentWords)
+//
+    if(count>0){
+        if(count==1){
+            localStorage.setItem("nowWords",replaceWords(currentWords,word))
+        }else{
+            localStorage.setItem("nowWords",replaceAllWords(currentWords,word,""))
+        }
+    }
+
+
+    pickedWords.value = localStorage.getItem("nowWords")
             document.getElementById("article").innerHTML = articleContent;
             return;
         }