diff --git a/app/static/js/fillword.js b/app/static/js/fillword.js
index 3e3fbd9..6fd7aad 100644
--- a/app/static/js/fillword.js
+++ b/app/static/js/fillword.js
@@ -1,29 +1,64 @@
-isRead = true;
-isChoose = true;
-var reader = window.speechSynthesis; // 全局定义朗读者，以便朗读和暂停
+let isRead = true;
+let isChoose = true;
+let reader = window.speechSynthesis; // 全局定义朗读者，以便朗读和暂停
+let cur_position = 0; // 朗读文本的当前位置
+let orig_position = 0; // 朗读文本的初始位置
+let to_speak = ""; // 朗读的初始内容
 
-function getWord(){
-   var word = window.getSelection?window.getSelection():document.selection.createRange().text;
-   return word;
+function getWord() {
+    return window.getSelection ? window.getSelection() : document.selection.createRange().text;
 }
-function fillinWord(){
-   var word = getWord();
-   if (isRead) read(word);
-   if (!isChoose) return;
-   var element = document.getElementById("selected-words");
-   element.value = element.value + " " + word;
+
+function fillInWord() {
+    let word = getWord();
+    if (isRead) read(word);
+    if (!isChoose) return;
+    const element = document.getElementById("selected-words");
+    element.value = element.value + " " + word;
 }
-document.getElementById("text-content").addEventListener("click", fillinWord, false);
-function read(s){
-   var msg = new SpeechSynthesisUtterance(s);
-   reader.speak(msg);
+
+document.getElementById("text-content").addEventListener("click", fillInWord, false);
+
+function makeUtterance(str, rate) {
+    let msg = new SpeechSynthesisUtterance(str);
+    msg.rate = rate;
+    msg.lang = "en-US"; // TODO: add language options menu
+    msg.onboundary = ev => {
+        if (ev.name == "word") {
+            cur_position = ev.charIndex;
+        }
+    }
+    return msg;
 }
-function onReadClick(){
+
+const sliderValue = document.getElementById("rangeValue"); // 显示值
+const inputSlider = document.getElementById("rangeComponent"); // 滑块元素
+inputSlider.oninput = () => {
+    let value = inputSlider.value; // 获取滑块的值
+    sliderValue.textContent = value + '×';
+    if (!reader.speaking) return;
+    reader.cancel();
+    let msg = makeUtterance(to_speak.substring(orig_position + cur_position), value);
+    orig_position = orig_position + cur_position;
+    cur_position = 0;
+    reader.speak(msg);
+};
+
+function read(s) {
+    to_speak = s.toString();
+    orig_position = 0;
+    cur_position = 0;
+    let msg = makeUtterance(to_speak, inputSlider.value);
+    reader.speak(msg);
+}
+
+function onReadClick() {
     isRead = !isRead;
-    if(!isRead){
-       reader.cancel();
+    if (!isRead) {
+        reader.cancel();
     }
 }
-function onChooseClick(){
+
+function onChooseClick() {
     isChoose = !isChoose;
 }
\ No newline at end of file
diff --git a/app/static/js/highlight.js b/app/static/js/highlight.js
index 2e0d84a..5ef3f3c 100644
--- a/app/static/js/highlight.js
+++ b/app/static/js/highlight.js
@@ -1,45 +1,44 @@
-var isHighlight = true;
+let isHighlight = true;
 
 function cancelBtnHandler() {
     cancel_highLight();
-    document.getElementById("text-content").removeEventListener("click", fillinWord, false);
-    document.getElementById("text-content").removeEventListener("touchstart", fillinWord, false);
-    document.getElementById("text-content").addEventListener("click", fillinWord2, false);
-    document.getElementById("text-content").addEventListener("touchstart", fillinWord2, false);
+    document.getElementById("text-content").removeEventListener("click", fillInWord, false);
+    document.getElementById("text-content").removeEventListener("touchstart", fillInWord, false);
+    document.getElementById("text-content").addEventListener("click", fillInWord2, false);
+    document.getElementById("text-content").addEventListener("touchstart", fillInWord2, false);
 }
 
 function showBtnHandler() {
-    document.getElementById("text-content").removeEventListener("click", fillinWord2, false);
-    document.getElementById("text-content").removeEventListener("touchstart", fillinWord2, false);
-    document.getElementById("text-content").addEventListener("click", fillinWord, false);
-    document.getElementById("text-content").addEventListener("touchstart", fillinWord, false);
+    document.getElementById("text-content").removeEventListener("click", fillInWord2, false);
+    document.getElementById("text-content").removeEventListener("touchstart", fillInWord2, false);
+    document.getElementById("text-content").addEventListener("click", fillInWord, false);
+    document.getElementById("text-content").addEventListener("touchstart", fillInWord, false);
     highLight();
 }
 
 function getWord() {
-    var word = window.getSelection ? window.getSelection() : document.selection.createRange().text;
-    return word;
+    return window.getSelection ? window.getSelection() : document.selection.createRange().text;
 }
 
 function highLight() {
-    if(!isHighlight) return;
-    var txt = document.getElementById("article").innerText;
-    var sel_word1 = document.getElementById("selected-words");
-    var sel_word2 = document.getElementById("selected-words2");
+    if (!isHighlight) return;
+    let txt = document.getElementById("article").innerText;
+    let sel_word1 = document.getElementById("selected-words");
+    let sel_word2 = document.getElementById("selected-words2");
     if (sel_word1 != null) {
-        var list = sel_word1.value.split(" ");
-        for (var i = 0; i < list.length; ++i) {
+        const list = sel_word1.value.split(" ");
+        for (let i = 0; i < list.length; ++i) {
             list[i] = list[i].replace(/(^\s*)|(\s*$)/g, "");
-            if (list[i] != "" && "<mark>".indexOf(list[i]) == -1 && "</mark>".indexOf(list[i]) == -1) {
+            if (list[i] !== "" && "<mark>".indexOf(list[i]) === -1 && "</mark>".indexOf(list[i]) === -1) {
                 txt = txt.replace(new RegExp(list[i], "g"), "<mark>" + list[i] + "</mark>");
             }
         }
     }
     if (sel_word2 != null) {
-        var list2 = sel_word2.value.split(" ");
-        for (var i = 0; i < list2.length; ++i) {
+        const list2 = sel_word2.value.split(" ");
+        for (let i = 0; i < list2.length; ++i) {
             list2[i] = list2[i].replace(/(^\s*)|(\s*$)/g, "");
-            if (list2[i] != "" && "<mark>".indexOf(list2[i]) == -1 && "</mark>".indexOf(list2[i]) == -1) {
+            if (list2[i] !== "" && "<mark>".indexOf(list2[i]) === -1 && "</mark>".indexOf(list2[i]) === -1) {
                 txt = txt.replace(new RegExp(list2[i], "g"), "<mark>" + list2[i] + "</mark>");
             }
         }
@@ -48,24 +47,24 @@ function highLight() {
 }
 
 function cancel_highLight() {
-    var txt = document.getElementById("article").innerText;
-    var sel_word1 = document.getElementById("selected-words");
-    var sel_word2 = document.getElementById("selected-words2");
+    const list = sel_word1.value.split(" ");
+    let txt = document.getElementById("article").innerText;
+    let sel_word1 = document.getElementById("selected-words");
+    const sel_word2 = document.getElementById("selected-words2");
     if (sel_word1 != null) {
-        var list = sel_word1.value.split(" ");
-        for (var i = 0; i < list.length; ++i) {
+        for (let i = 0; i < list.length; ++i) {
             list[i] = list[i].replace(/(^\s*)|(\s*$)/g, "");
-            if (list[i] != "") {
+            if (list[i] !== "") {
                 txt = txt.replace("<mark>" + list[i] + "</mark>", "list[i]");
             }
         }
     }
     if (sel_word2 != null) {
-        var list2 = sel_word1.value.split(" ");
-        for (var i = 0; i < list2.length; ++i) {
-            var list2 = sel_word2.value.split(" ");
+        let list2 = sel_word1.value.split(" ");
+        for (let i = 0; i < list2.length; ++i) {
+            list2 = sel_word2.value.split(" ");
             list2[i] = list2[i].replace(/(^\s*)|(\s*$)/g, "");
-            if (list2[i] != "") {
+            if (list2[i] !== "") {
                 txt = txt.replace("<mark>" + list[i] + "</mark>", "list[i]");
             }
         }
@@ -73,11 +72,11 @@ function cancel_highLight() {
     document.getElementById("article").innerHTML = txt;
 }
 
-function fillinWord() {
+function fillInWord() {
     highLight();
 }
 
-function fillinWord2() {
+function fillInWord2() {
     cancel_highLight();
 }
 
@@ -92,4 +91,4 @@ function ChangeHighlight() {
     }
 }
 
-showBtnHandler();
+showBtnHandler();
\ No newline at end of file
diff --git a/app/templates/userpage_get.html b/app/templates/userpage_get.html
index d807b4e..7fb3bb2 100644
--- a/app/templates/userpage_get.html
+++ b/app/templates/userpage_get.html
@@ -35,7 +35,14 @@
     <input type="checkbox" onclick="ChangeHighlight()" checked/>生词高亮
     <input type="checkbox" onclick="onReadClick()" checked/>大声朗读
     <input type="checkbox" onclick="onChooseClick()" checked/>划词入库
-
+    <div class="range">
+        <div class="field">
+            <div class="sliderValue">
+                <span id="rangeValue">1×</span>
+            </div>
+        <input type="range" id="rangeComponent" min="0.5" max="2" value="1" step="0.25" "/>
+        </div>
+    </div>    
     <p><b>收集生词吧</b> （可以在正文中划词，也可以复制黏贴）</p>
     <form method="post" action="/{{ username }}">
         <textarea name="content" id="selected-words" rows="10" cols="120"></textarea><br/>