userpaget_get.html: Resolve conflict

Reviewed-on: #162

app/Article.py

@@ -9,10 +9,32 @@ from flask import Flask, request, redirect, render_template, url_for, session, a
 from difficulty import get_difficulty_level_for_user, text_difficulty_level, user_difficulty_level
 from model.article import get_all_articles, get_article_by_id, get_number_of_articles
 import logging
-
+import re
 path_prefix = './'
 db_path_prefix = './db/'  # comment this line in deployment
+oxford_words_path='./db/oxford_words.txt'
 
+def count_oxford_words(text, oxford_words):
+    words = re.findall(r'\b\w+\b', text.lower())
+    total_words = len(words)
+    oxford_word_count = sum(1 for word in words if word in oxford_words)
+    return oxford_word_count, total_words
+
+def calculate_ratio(oxford_word_count, total_words):
+    if total_words == 0:
+        return 0
+    return oxford_word_count / total_words
+
+def load_oxford_words(file_path):
+    oxford_words = {}
+    with open(file_path, 'r', encoding='utf-8') as file:
+        for line in file:
+            parts = line.strip().split()
+            word = parts[0]
+            pos = parts[1]
+            level = parts[2]
+            oxford_words[word] = {'pos': pos, 'level': level}
+    return oxford_words
 
 def total_number_of_essays():
     return get_number_of_articles()
@@ -86,6 +108,9 @@ def get_today_article(user_word_list, visited_articles):
 
     today_article = None
     if d:
+        oxford_words = load_oxford_words(oxford_words_path)
+        oxford_word_count, total_words = count_oxford_words(d['text'],oxford_words)
+        ratio = calculate_ratio(oxford_word_count,total_words)
         today_article = {
             "user_level": '%4.1f' % user_level,
             "text_level": '%4.1f' % text_level,
@@ -94,7 +119,8 @@ def get_today_article(user_word_list, visited_articles):
             "article_body": get_article_body(d['text']),
             "source": d["source"],
             "question": get_question_part(d['question']),
-            "answer": get_answer_part(d['question'])
+            "answer": get_answer_part(d['question']),
+            "ratio" : ratio
         }
 
     return visited_articles, today_article, result_of_generate_article

app/admin_service.py

@@ -79,18 +79,18 @@ def article():
         "username": session.get("username"),
     }
 
-
-    if request.method == "GET":
-        try:
-            delete_id = int(request.args.get("delete_id", 0))
-        except:
-            return "Delete article ID must be integer!"
-        if delete_id:  # delete article
-            delete_article_by_id(delete_id)
-            _update_context()
-
-    elif request.method == "POST":
+    if request.method == "POST":
         data = request.form
+
+        if "delete_id" in data:
+            try:
+                delete_id = int(data["delete_id"])  # 转成int型
+                delete_article_by_id(delete_id)  # 根据id删除article
+                flash(f'Article ID {delete_id} deleted successfully.')  # 刷新页首提示语
+                _update_context()
+            except ValueError:
+                flash('Invalid article ID for deletion.')  # 刷新页首提示语
+
         content = data.get("content", "")
         source = data.get("source", "")
         question = data.get("question", "")
@@ -99,9 +99,9 @@ def article():
             if level not in ['1', '2', '3', '4']:
                 return "Level must be between 1 and 4."
             add_article(content, source, level, question)
-            _update_context()
             title = content.split('\n')[0]
             flash(f'Article added. Title: {title}')
+            _update_context()  # 这行应在flash之后 否则会发生新建的文章即点即删
 
     return render_template("admin_manage_article.html", **context)
 

app/main.py

@@ -79,6 +79,19 @@ def mainpage():
     根据GET或POST方法来返回不同的主界面
     :return: 主界面
     '''
+
+    article_text = get_all_articles()
+    texts = [item['text'] for item in article_text]
+    oxford_words = load_oxford_words(oxford_words_path)  
+
+    # 提取所有单词
+    all_words = []
+    for text in texts:
+        words = re.findall(r'\b\w+\b', text.lower())
+        all_words.extend(words)
+    oxford_word_count = sum(1 for word in all_words if word in oxford_words)
+    ratio = calculate_ratio(oxford_word_count, len(all_words))
+
     if request.method == 'POST':  # when we submit a form
         content = escape(request.form['content'])
         f = WordFreq(content)
@@ -102,7 +115,8 @@ def mainpage():
                                d_len=d_len,
                                lst=lst,
                                yml=Yaml.yml,
-                               number_of_essays=number_of_essays)
+                               number_of_essays=number_of_essays,
+                               ratio = ratio)
 
 
 if __name__ == '__main__':

app/static/css/button.css

@@ -0,0 +1,37 @@
+/* 按钮(上一篇，下一篇)样式 */
+.pagination {
+  padding: 20px;
+  max-width: 600px;
+}
+
+.arrow {
+  margin-right: 15px;
+  display: flex;
+  align-items: center;
+  background: #007BFF; /* 按钮背景颜色 */
+  border: none;
+  color: #FFF; /* 按钮文字颜色 */
+  padding: 5px 12px;
+  font-size: 20px;
+  border-radius: 5px;
+  transition: background-color 0.3s ease;
+}
+
+.arrow i {
+  margin: 0 5px;
+}
+
+.arrow:hover {
+  background-color: #0056b3; /* 按钮悬停时的背景颜色 */
+  cursor: pointer;
+}
+
+.arrow:focus {
+  outline: none;
+  box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.5);
+}
+
+/* 为首页时按钮(Pre Article)的背景颜色 */
+.gray-background {
+    background-color: #6c757d !important;
+}

app/static/css/slide-unlock.css

@@ -0,0 +1,52 @@
+
+#slider {
+  margin: 20px auto;
+  width: 200px;
+  height: 40px;
+  position: relative;
+  border-radius: 5px;
+  background-color: #dae2d0;
+  overflow: hidden;
+  text-align: center;
+  user-select: none;
+  -moz-user-select: none;
+  -webkit-user-select: none;
+}
+
+#slider_bg {
+  position: absolute;
+  left: 0;
+  top: 0;
+  height: 100%;
+  background-color: #7AC23C;
+  z-index: 1;
+}
+
+#label {
+  width: 46px;
+  position: absolute;
+  left: 0;
+  top: 0;
+  height: 38px;
+  line-height: 38px;
+  border: 1px solid #cccccc;
+  background: #fff;
+  z-index: 3;
+  cursor: move;
+  color: #ff9e77;
+  font-size: 16px;
+  font-weight: 900;
+}
+
+#labelTip {
+  position: absolute;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  font-size: 13px;
+  font-family: 'Microsoft Yahei', serif;
+  color: #787878;
+  line-height: 38px;
+  text-align: center;
+  z-index: 2;
+}

app/static/js/jquery.slideunlock.js

@@ -0,0 +1,200 @@
+/**
+ * jquery plugin -- jquery.slideunlock.js
+ * Description: a slideunlock plugin based on jQuery
+ * Version: 1.1
+ * Author: Dong Yuhao
+ * created: March 27, 2016
+ */
+
+;(function ($,window,document,undefined) {
+    function SliderUnlock(elm, options, success){
+        var me = this;
+        var $elm = me.checkElm(elm) ? $(elm) : $;
+        success = me.checkFn(success) ? success : function(){};
+
+        var opts = {
+            successLabelTip:  "Successfully Verified",
+            duration:  200,
+            swipestart:  false,
+            min:  0,
+            max:  $elm.width(),
+            index:  0,
+            isOk:  false,
+            lableIndex:  0
+        };
+
+        opts = $.extend(opts, options||{});
+
+        //$elm
+        me.elm = $elm;
+        //opts
+        me.opts = opts;
+        //是否开始滑动
+        me.swipestart = opts.swipestart;
+        //最小值
+        me.min = opts.min;
+        //最大值
+        me.max = opts.max;
+        //当前滑动条所处的位置
+        me.index = opts.index;
+        //是否滑动成功
+        me.isOk = opts.isOk;
+        //滑块宽度
+        me.labelWidth = me.elm.find('#label').width();
+        //滑块背景
+        me.sliderBg = me.elm.find('#slider_bg');
+        //鼠标在滑动按钮的位置
+        me.lableIndex = opts.lableIndex;
+        //success
+        me.success = success;
+    }
+
+    SliderUnlock.prototype.init = function () {
+        var me = this;
+
+        me.updateView();
+        me.elm.find("#label").on("mousedown", function (event) {
+            var e = event || window.event;
+            me.lableIndex = e.clientX - this.offsetLeft;
+            me.handerIn();
+        }).on("mousemove", function (event) {
+            me.handerMove(event);
+        }).on("mouseup", function (event) {
+            me.handerOut();
+        }).on("mouseout", function (event) {
+            me.handerOut();
+        }).on("touchstart", function (event) {
+            var e = event || window.event;
+            me.lableIndex = e.originalEvent.touches[0].pageX - this.offsetLeft;
+            me.handerIn();
+        }).on("touchmove", function (event) {
+            me.handerMove(event, "mobile");
+        }).on("touchend", function (event) {
+            me.handerOut();
+        });
+    };
+    SliderUnlock.prototype.getIsOk = function() {
+        return this.isOk;
+    };
+
+    /**
+     * 鼠标/手指接触滑动按钮
+     */
+    SliderUnlock.prototype.handerIn = function () {
+        var me = this;
+        me.swipestart = true;
+        me.min = 0;
+        me.max = me.elm.width();
+    };
+
+    /**
+     * 鼠标/手指移出
+     */
+    SliderUnlock.prototype.handerOut = function () {
+        var me = this;
+        //停止
+        me.swipestart = false;
+        //me.move();
+        if (me.index < me.max) {
+            me.reset();
+        }
+    };
+
+    /**
+     * 鼠标/手指移动
+     * @param event
+     * @param type
+     */
+    SliderUnlock.prototype.handerMove = function (event, type) {
+        var me = this;
+        if (me.swipestart) {
+            event.preventDefault();
+            event = event || window.event;
+            if (type == "mobile") {
+                me.index = event.originalEvent.touches[0].pageX - me.lableIndex;
+            } else {
+                me.index = event.clientX - me.lableIndex;
+            }
+            me.move();
+        }
+    };
+
+    /**
+     * 鼠标/手指移动过程
+     */
+    SliderUnlock.prototype.move = function () {
+        var me = this;
+        if ((me.index + me.labelWidth) >= me.max) {
+            me.index = me.max - me.labelWidth -2;
+            //停止
+            me.swipestart = false;
+            //解锁
+            me.isOk = true;
+        }
+        if (me.index < 0) {
+            me.index = me.min;
+            //未解锁
+            me.isOk = false;
+        }
+        if (me.index+me.labelWidth+2 == me.max && me.max > 0 && me.isOk) {
+            //解锁默认操作
+            $('#label').unbind().next('#labelTip').
+            text(me.opts.successLabelTip).css({'color': '#fff'});
+
+            me.success();
+        }
+        me.updateView();
+    };
+
+
+    /**
+     * 更新视图
+     */
+    SliderUnlock.prototype.updateView = function () {
+        var me = this;
+
+        me.sliderBg.css('width', me.index);
+        me.elm.find("#label").css("left", me.index + "px")
+    };
+
+    /**
+     * 重置slide的起点
+     */
+    SliderUnlock.prototype.reset = function () {
+        var me = this;
+
+        me.index = 0;
+        me.sliderBg .animate({'width':0},me.opts.duration);
+        me.elm.find("#label").animate({left: me.index}, me.opts.duration)
+            .next("#lableTip").animate({opacity: 1}, me.opts.duration);
+        me.updateView();
+    };
+
+    /**
+     * 检测元素是否存在
+     * @param elm
+     * @returns {boolean}
+     */
+    SliderUnlock.prototype.checkElm = function (elm) {
+        if($(elm).length > 0){
+            return true;
+        }else{
+            throw "this element does not exist.";
+        }
+    };
+
+    /**
+     * 检测传入参数是否是function
+     * @param fn
+     * @returns {boolean}
+     */
+    SliderUnlock.prototype.checkFn = function (fn) {
+        if(typeof fn === "function"){
+            return true;
+        }else{
+            throw "the param is not a function.";
+        }
+    };
+
+    window['SliderUnlock'] = SliderUnlock;
+})(jQuery, window, document);

app/templates/admin_manage_article.html

@@ -7,6 +7,11 @@
         content="width=device-width, initial-scale=1.0, minimum-scale=0.5, maximum-scale=3.0, user-scalable=yes" />
     <meta name="format-detection" content="telephone=no" />
     <link href="../static/css/bootstrap.css" rel="stylesheet">
+    <script>
+        function confirmDeletion(articleId, articleTitle) {
+            return confirm(`确认删除文章 "${articleTitle}" (ID: ${articleId}) 吗？`);
+        }
+    </script>
 </head>
 
 <body class="container" style="width: 800px; margin: auto; margin-top:24px;">
@@ -66,9 +71,10 @@
         <div class="list-group">
             {% for text in text_list %}
             <div class="list-group-item list-group-item-action" aria-current="true">
-                <div>
-                    <a type="button" href="/admin/article?delete_id={{text.article_id}}" class="btn btn-outline-danger btn-sm">删除</a>
-                </div>
+                <form action="/admin/article" method="post" style="display: inline;">
+                    <input type="hidden" name="delete_id" value="{{ text.article_id }}">
+                    <button type="submit" class="btn btn-outline-danger btn-sm" onclick="return confirmDeletion('{{ text.article_id }}', '{{ text.title }}')">删除</button>
+                </form>
                 <div class="d-flex w-100 justify-content-between">
                     <h5 class="mb-1">{{ text.title }}</h5>
                 </div>

app/templates/mainpage_get.html

@@ -31,7 +31,7 @@
             <p><a href="/login">登录</a>  <a href="/signup">注册</a> <a href="/static/usr/instructions.html">使用说明</a></p >
             <p><b> {{ random_ads }}。 <a href="/signup">试试</a>吧！</b></p>
         {% endif %}
-        <div class="alert alert-success" role="alert">共有文章 <span class="badge bg-success"> {{ number_of_essays }} </span> 篇</div>
+        <div class="alert alert-success" role="alert">共有文章 <span class="badge bg-success"> {{ number_of_essays }} </span> 篇，覆盖 <span class="badge bg-success"> {{ (ratio * 100) | int }}%  </span> 的 Oxford5000 单词</div>
         <p>粘贴1篇文章 (English only)</p>
         <form method="post" action="/">
             <textarea name="content" id="article" rows="10" cols="120"></textarea><br/>

app/templates/signup.html

@@ -1,72 +1,107 @@
 {% block body %}
 {% if session['logged_in'] %}
-
-You're logged in already! <a href="/logout">Logout</a>.
-
+    You're logged in already! <a href="/logout">Logout</a>.
 {% else %}
-<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=0.5, maximum-scale=3.0, user-scalable=yes" />
-<link rel="stylesheet" href="static/css/login_service.css">
-<script src="static/js/jquery.js"></script>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=0.5, maximum-scale=3.0, user-scalable=yes" />
+    <link rel="stylesheet" href="static/css/login_service.css">
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE-edge,chrome=1">
+    <link href="static/css/slide-unlock.css" rel="stylesheet">
+    <script src="static/js/jquery.js"></script>
+    <script src="static/js/jquery.slideunlock.js"></script>
     <script>
-        function signup() {
-            let username = $("#username").val();
-            let password = $("#password").val();
-            let password2 = $("#password2").val();
-            if (username === "" || password === "" || password2 === ""){
-                alert('输入不能为空!');
-                return false;
-            }
-            if (password.includes(' ') || password2.includes(' ')) {
-                alert('输入不能包含空格!');
-                return false;
-            }
-            if (password !== password2) {
-                alert('确认密码与输入密码不一致！');
-                return false;
-            }
-            if (password.length < 4) {
-                alert('密码过于简单。(密码长度至少4位)');
-                return false;
-            }
-            $.post("/signup", {'username': username, 'password': password},
-                function (response) {
-                    if (response.status === '0') {
-                        alert('用户名'+username+'已经被注册。');
-                        window.location.href = "/signup";
-                    } else if (response.status === '1') {
-                        alert('用户名密码验证失败。');
-                        window.location.href = "/signup";
-                    } else if (response.status === '2') {
-                        let f = confirm("恭喜，你已成功注册，你的用户名是"+username+'.\n点击“确认”开始使用，或点击“取消”返回首页');
-                        if (f) {
-                            window.location.href = '/'+username+'/userpage';
-                        } else {
-                            window.location.href = '/';
-                        }
-                    } else if (response.status === '3') {
-                        alert(response.warn);
-                    }
-                }
-            )
+    var slider
+    let username,password,password2
+    $(document).ready(function() {
+        slider = new SliderUnlock("#slider", {
+                successLabelTip: "验证成功"
+            }, function() {
+
+        });
+        slider.init(); // 初始化滑块解锁功能
+    });
+
+    function signup(){
+        // 发起 AJAX 请求来处理注册
+        username = $("#username").val().trim();
+        password = $("#password").val().trim();
+        password2 = $("#password2").val().trim();
+
+        // 基本表单验证
+        if (username === "" || password === "" || password2 === "") {
+            alert('输入不能为空!');
             return false;
         }
+        if (password.includes(' ') || password2.includes(' ')) {
+            alert('输入不能包含空格!');
+            return false;
+        }
+        if (password !== password2) {
+            alert('确认密码与输入密码不一致！');
+            return false;
+        }
+        if (password.length < 4) {
+            alert('密码过于简单。(密码长度至少4位)');
+            return false;
+        }
+        is_ok = slider.getIsOk();
+        if(!is_ok){
+            alert('没有滑动验证');
+            return false;
+        }
+        $.post("/signup", {
+            'username': username,
+            'password': password
+        }, function(response) {
+            if (response.status === '0') {
+                alert('用户名' + username + '已经被注册。');
+                window.location.href = "/signup";
+            } else if (response.status === '1') {
+                alert('用户名密码验证失败。');
+                window.location.href = "/signup";
+            } else if (response.status === '2') {
+                var f = confirm("恭喜，你已成功注册，你的用户名是" + username + '.\n点击“确认”开始使用，或点击“取消”返回首页');
+                if (f) {
+                    window.location.href = '/' + username + '/userpage';
+                } else {
+                    window.location.href = '/';
+                }
+            } else if (response.status === '3') {
+                alert(response.warn);
+            }
+        });
+        return false;
+    }
+</script>
+    <p>{{ get_flashed_messages()[0] | safe }}</p>
+
+    <div class="container">
+        <section class="signin-heading">
+            <h1>Sign up</h1>
+        </section>
+
+        <form>
+            <p><input type="text" id="username" placeholder="输入用户名" class="username"></p>
+            <p><input type="password" id="password" placeholder="输入密码" class="password"></p>
+            <p><input type="password" id="password2" placeholder="确认密码" class="password"></p>
+
+            <div id="slider">
+                <div id="slider_bg"></div>
+                <span id="label">>></span> <span id="labelTip">-----滑动验证你是不是人类</span>
+            </div>
+
+            <button type="button" class="btn" onclick="signup()">注册</button>
+        </form>
+    </div>
+
+    <script>
+        // Bind click event to the signup button
+        $(".btn").click(function() {
+            // Trigger slider unlock
+            var slider = new SliderUnlock("#slider");
+            slider.isOk();
+        });
     </script>
-<p>{{ get_flashed_messages()[0] | safe }}</p>
-
-
-<div class="container">
-
-  <section class="signin-heading">
-    <h1>Sign up</h1>
-  </section>
-
-  <p><input type="username" id="username" placeholder="输入用户名" class="username"></p>
-  <p><input type="password" id="password" placeholder="输入密码" class="password"></p>
-  <p><input type="password" id="password2" placeholder="确认密码" class="password" ></p>
-  <button type="button" class="btn" onclick="signup()">注册</button>
-
-</div>
 
 {% endif %}
 {% endblock %}
-

app/templates/userpage_get.html

@@ -6,6 +6,8 @@
           content="width=device-width, initial-scale=1.0, minimum-scale=0.5, maximum-scale=3.0, user-scalable=yes"/>
     <meta name="format-detection" content="telephone=no"/>
     <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.1/dist/css/bootstrap.min.css" rel="stylesheet">
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0-beta3/css/all.min.css">
+    <link rel="stylesheet" href="../static/css/button.css">
     <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.1/dist/js/bootstrap.bundle.min.js"></script>
 
     {{ yml['header'] | safe }}
@@ -71,15 +73,20 @@
 	<button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
     </div>
     {% endfor %}
-
-        <button class="arrow" id="load_next_article" onclick="load_next_article();Reader.stopRead()" title="下一篇 Next Article">⇨</button>
-        <button class="arrow" id="load_pre_article" onclick="load_pre_article();Reader.stopRead()" style="display: none" title="上一篇 Previous Article">⇦</button>
+        <div class="pagination">
+          <button class="arrow" id="load_pre_article" onclick="load_pre_article();Reader.stopRead()" title="Previous Article">
+            <i class="fas fa-chevron-left"></i> 上一篇
+          </button>
+          <button class="arrow" id="load_next_article" onclick="load_next_article();Reader.stopRead()" title="Next Article">
+             下一篇 <i class="fas fa-chevron-right"></i>
+          </button>
+        </div>
 
     <p><b>阅读文章并回答问题</b></p>
     <div id="text-content">
         <div id="found">
-            <div class="alert alert-success" role="alert">According to your word list, your level is <span class="text-decoration-underline" id="user_level">{{ today_article["user_level"] }}</span>  and we have chosen an article with a difficulty level of <span class="text-decoration-underline" id="text_level">{{ today_article["text_level"] }}</span> for you.</div>
-                <p class="text-muted" id="date">Article added on: {{ today_article["date"] }}</p><br/>
+          <div class="alert alert-success" role="alert">According to your word list, your level is <span class="text-decoration-underline" id="user_level">{{ today_article["user_level"] }}</span>  and we have chosen an article with a difficulty level of <span class="text-decoration-underline" id="text_level">{{ today_article["text_level"] }}</span> for you. The Oxford word coverage is <span class="text-decoration-underline" id="ratio">{{ (today_article["ratio"] * 100) | int }}%.</span></div>
+            <p class="text-muted" id="date">Article added on: {{ today_article["date"] }}</p><br/>
             <div class="p-3 mb-2 bg-light text-dark" style="margin: 0 0.5%;"><br/>
             <p class="display-6" id="article_title">{{ today_article["article_title"] }}</p><br/>
             <p class="lead"><font id="article">{{ today_article["article_body"] }}</font></p><br/>
@@ -166,7 +173,6 @@
         <input id="selected-words2" type="hidden" value="{{ words }}">
     {% endif %}
 </div>
-<label id="selected-words3" type="hidden"></label>
 {{ yml['footer'] | safe }}
 {% if yml['js']['bottom'] %}
     {% for js in yml['js']['bottom'] %}
@@ -198,11 +204,12 @@
         elements.chooseCheckbox.checked = settings.chooseChecked;
         elements.rangeComponent.value = settings.rangeValue;
         elements.rangeValueDisplay.textContent = `${settings.rangeValue}x`;
-        elements.selectedWordsInput.value = settings.selectedWords;
+<!--        elements.selectedWordsInput.value = settings.selectedWords;-->
 
-        // 刷新页面或进入页面时判断，若不是首篇文章，则上一篇按钮可见
-        if (sessionStorage.getItem('pre_page_button') !== 'display' && sessionStorage.getItem('pre_page_button')) {
-            $('#load_pre_article').show();
+
+        // 刷新页面或进入页面时判断，若是首篇文章，则颜色为灰色
+        if (sessionStorage.getItem('pre_page_button') === 'display' || !sessionStorage.getItem('pre_page_button')) {
+            $('#load_pre_article').addClass('gray-background');
         }
 
         // 事件监听器
@@ -230,6 +237,9 @@
             success: function(data) {
                 // 更新页面内容
                 if(data['today_article']){
+                    // answer不可见
+                    const e = document.getElementById('answer');
+                    e.style.display = 'none';
                     update(data['today_article']);
                     check_pre(data['visited_articles']);
                     check_next(data['result_of_generate_article']);
@@ -244,6 +254,9 @@
             success: function(data) {
                 // 更新页面内容
                 if(data['today_article']){
+                    // answer不可见
+                    const e = document.getElementById('answer');
+                    e.style.display = 'none';
                     update(data['today_article']);
                     check_pre(data['visited_articles']);
                 }
@@ -259,18 +272,18 @@
         $('#source').html(today_article['source']);
         $('#question').html(today_article["question"]);
         $('#answer').html(today_article["answer"]);
+        $('#ratio').html(Math.round(today_article["ratio"] * 100) + '%');
         document.querySelector('#text_level').classList.add('mark'); // highlight text difficult level for 2 seconds
         setTimeout(() => {document.querySelector('#text_level').classList.remove('mark');}, 2000);
         document.querySelector('#user_level').classList.add('mark'); // do the same thing for user difficulty level
         setTimeout(() => {document.querySelector('#user_level').classList.remove('mark');}, 2000);
     }
-<!-- 检查是否存在上一篇或下一篇，不存在则对应按钮隐藏-->
     function check_pre(visited_articles){
         if((visited_articles=='')||(visited_articles['index']<=0)){
-            $('#load_pre_article').hide();
+            $('#load_pre_article').addClass('gray-background'); // 设置为灰色
             sessionStorage.setItem('pre_page_button', 'display')
         }else{
-            $('#load_pre_article').show();
+            $('#load_pre_article').removeClass('gray-background'); // 设置为正常蓝色
             sessionStorage.setItem('pre_page_button', 'show')
         }
     }