diff --git a/Wherlog/Controls/MarkdownSection.razor.cs b/Wherlog/Controls/MarkdownSection.razor.cs
index bfdb1a8..31357ac 100644
--- a/Wherlog/Controls/MarkdownSection.razor.cs
+++ b/Wherlog/Controls/MarkdownSection.razor.cs
@@ -34,30 +34,27 @@ public string InternalContent
             get => _content;
             set
             {
-                _content = value;
-                HtmlContent = ConvertToMarkupString(_content);
-
-                if (OnContentConverted.HasDelegate)
+                if (_content != value)
                 {
-                    OnContentConverted.InvokeAsync();
+                    _content = value;
+
+                    HtmlContent = string.IsNullOrWhiteSpace(value)
+                        ? new MarkupString(value)
+                        : ConvertToMarkupString(_content);
+
+                    if (OnContentConverted.HasDelegate)
+                    {
+                        OnContentConverted.InvokeAsync();
+                    }
+
+                    _raiseContentConverted = true;
+                    StateHasChanged();
                 }
-                _raiseContentConverted = true;
-                StateHasChanged();
             }
         }
 
         public MarkupString HtmlContent { get; private set; }
 
-        protected override void OnInitialized()
-        {
-            if (Content == null)
-            {
-                throw new ArgumentNullException(nameof(Content), "You need to provide either Content or FromAsset parameter");
-            }
-
-            InternalContent = Content;
-        }
-
         protected override void OnParametersSet() => InternalContent = Content;
 
         protected override async Task OnAfterRenderAsync(bool firstRender)
diff --git a/Wherlog/Controls/MarkdownSection.razor.js b/Wherlog/Controls/MarkdownSection.razor.js
index b6442be..4c7ef75 100644
--- a/Wherlog/Controls/MarkdownSection.razor.js
+++ b/Wherlog/Controls/MarkdownSection.razor.js
@@ -1,29 +1,27 @@
 export function highlight() {
-    var preTagList = document.getElementsByTagName('pre');
-    var numberOfPreTags = preTagList.length;
-    for (var i = 0; i < numberOfPreTags; i++) {
-        var codeTag = preTagList[i].getElementsByTagName('code');
+    const preTagList = document.getElementsByTagName('pre');
+    const numberOfPreTags = preTagList.length;
+    for (let i = 0; i < numberOfPreTags; i++) {
+        const codeTag = preTagList[i].getElementsByTagName('code');
         hljs.highlightElement(codeTag[0]);
     }
 }
 
 export function addCopyButton() {
-    var snippets = document.querySelectorAll('.snippet');
-    var numberOfSnippets = snippets.length;
-    for (var i = 0; i < numberOfSnippets; i++) {
+    const snippets = document.querySelectorAll('.snippet');
+    const numberOfSnippets = snippets.length;
+    for (let i = 0; i < numberOfSnippets; i++) {
         let copyButton = snippets[i].getElementsByClassName("hljs-copy")
         if (copyButton.length === 0) {
             let code = snippets[i].getElementsByTagName('code')[0].innerText;
             snippets[i].innerHTML = snippets[i].innerHTML + '<button class="hljs-copy">Copy</button>'; // append copy button
 
-            copyButton[0].addEventListener("click", function () {
+            copyButton[0].addEventListener("click", () => {
                 navigator.clipboard.writeText(code);
 
                 this.innerText = 'Copied!';
                 let button = this;
-                setTimeout(function () {
-                    button.innerText = 'Copy';
-                }, 1000)
+                setTimeout(() => button.innerText = 'Copy', 1000)
             });
         }
     }
diff --git a/Wherlog/Controls/PostCard.razor.js b/Wherlog/Controls/PostCard.razor.js
index c719d97..ca1782d 100644
--- a/Wherlog/Controls/PostCard.razor.js
+++ b/Wherlog/Controls/PostCard.razor.js
@@ -1,7 +1,7 @@
 export function highlight() {
-    var elements = document.getElementsByClassName('highlight');
-    var numberOfElements = elements.length;
-    for (var i = 0; i < numberOfElements; i++) {
+    const elements = document.getElementsByClassName('highlight');
+    const numberOfElements = elements.length;
+    for (let i = 0; i < numberOfElements; i++) {
         setElements(elements[i]);
     }
     function setElements(element) {
@@ -11,20 +11,20 @@
         if (element?.className) {
             element.className = 'hljs-' + element.className;
         }
-        var numberOfElements = +element?.children.length;
-        for (var i = 0; i < numberOfElements; i++) {
+        const numberOfElements = +element?.children.length;
+        for (let i = 0; i < numberOfElements; i++) {
             setElements(element.children[i]);
         }
     }
 }
 
 export function fixEmoji() {
-    var images = document.getElementsByClassName('emoji');
-    var numberOfElements = images.length;
-    for (var i = 0; i < numberOfElements; i++) {
-        var image = images[i];
+    const images = document.getElementsByClassName('emoji');
+    const numberOfElements = images.length;
+    for (let i = 0; i < numberOfElements; i++) {
+        const image = images[i];
         if (image.tagName === 'IMG') {
-            var src = image.getAttribute('data-src');
+            const src = image.getAttribute('data-src');
             if (src) {
                 image.removeAttribute('data-src');
                 image.setAttribute('src', src);
diff --git a/Wherlog/Controls/TableOfContents.razor.js b/Wherlog/Controls/TableOfContents.razor.js
index 4c79ee0..b66b4b6 100644
--- a/Wherlog/Controls/TableOfContents.razor.js
+++ b/Wherlog/Controls/TableOfContents.razor.js
@@ -2,7 +2,7 @@
     const article = document.getElementById('article');
     const headings = article.querySelectorAll("h2, h3, h4");
 
-    let tocArray = new Array()
+    const tocArray = [];
     let chapter = null;
     let subchapter = null;
 
@@ -17,7 +17,7 @@
                 "level": element.nodeName,
                 "text": element.innerText,
                 "href": "#" + element.id,
-                "anchors": new Array()
+                "anchors": []
             };
 
             if ("H3" === element.nodeName) {
@@ -34,14 +34,13 @@
             else {
                 chapter = anchor;
                 tocArray.push(chapter);
-
             }
         }
     }
     return tocArray;
 }
 
-let backToTopButton = document.getElementById("backtotop");
+const backToTopButton = document.getElementById("backtotop");
 
 // When the user scrolls down 20px from the top of the document, show the button
 let bodycontent = document.getElementById('body-content');
@@ -49,17 +48,13 @@ if (!bodycontent) {
     bodycontent = document.body;
 }
 
-bodycontent.onscroll = function () {
-    scrollFunction()
-};
-
-function scrollFunction() {
+bodycontent.onscroll = () => {
     if (document.body.scrollTop > 20 || document.getElementById('body-content').scrollTop > 20 || document.documentElement.scrollTop > 20) {
         backToTopButton.style.display = "flex";
     } else {
         backToTopButton.style.display = "none";
     }
-}
+};
 
 // When the user clicks on the button, scroll to the top of the document
 export function backToTop() {
diff --git a/Wherlog/Pages/ToolsPages/BiliBiliCardPage.razor b/Wherlog/Pages/ToolsPages/BiliBiliCardPage.razor
index 3517165..52f8d50 100644
--- a/Wherlog/Pages/ToolsPages/BiliBiliCardPage.razor
+++ b/Wherlog/Pages/ToolsPages/BiliBiliCardPage.razor
@@ -45,8 +45,8 @@
     private string id;
     private string url;
     private string json;
-    private string imageProxy = "https://images.weserv.nl/?url=";
-    private string example = string.Empty;
+    private string imageProxy;
+    private string example;
 
     private string ID
     {
@@ -81,31 +81,34 @@
             JsonDocument token = JsonDocument.Parse(json);
             if (token.RootElement.TryGetProperty("data", out JsonElement data))
             {
-                List<string> attributes = new(9)
+                StringBuilder builder =
+                    new StringBuilder("<bilibili-card")
+                        .Append(" vid=\"").Append(data.GetProperty("bvid").GetString()).Append('"')
+                        .Append(" title=\"").Append(data.GetProperty("title").GetString()).Append('"')
+                        .Append(" author=\"").Append(data.GetProperty("owner").GetProperty("name").GetString()).Append('"')
+                        .Append(" cover=\"").Append(data.GetProperty("pic").GetString()).Append('"')
+                        .Append(" duration=\"").Append(FormatSecondsToTime(data.GetProperty("duration").GetInt64())).Append('"');
+
+                if (data.TryGetProperty("stat", out JsonElement stat))
                 {
-                    "bilibili-card",
-                    $"vid=\"{data.GetProperty("bvid").GetString()}\"",
-                    $"title=\"{data.GetProperty("title").GetString()}\"",
-                    $"author=\"{data.GetProperty("owner").GetProperty("name").GetString()}\"",
-                    $"cover=\"{data.GetProperty("pic").GetString()}\"",
-                    $"duration=\"{FormatSecondsToTime(data.GetProperty("duration").GetInt64())}\"",
-                };
-                JsonElement stat = data.GetProperty("stat");
-                attributes.Add($"views=\"{FormatLargeNumber(stat.GetProperty("view").GetInt64())}\"");
-                attributes.Add($"danmakus=\"{FormatLargeNumber(stat.GetProperty("danmaku").GetInt64())}\"");
+                    _ = builder.Append(" views=\"").Append(FormatLargeNumber(stat.GetProperty("view").GetInt64())).Append('"')
+                               .Append(" danmakus=\"").Append(FormatLargeNumber(stat.GetProperty("danmaku").GetInt64())).Append('"');
+                }
+
                 if (!string.IsNullOrEmpty(imageProxy))
                 {
-                    attributes.Add($"views=\"{imageProxy}\"");
+                    _ = builder.Append(" image-proxy=\"").Append(imageProxy).Append('"');
                 }
-                string element = $"<{string.Join(" ", attributes)}></bilibili-card>";
+
+                string element = builder.Append("></bilibili-card>").ToString();
                 const string script = "<script src=\"https://unpkg.com/hexo-tag-bilibili-card/components/bilibili-card/bilibili-card.js\"></script>";
                 example = new StringBuilder()
-                                .AppendLine(script)
-                                .AppendLine(element)
-                                .AppendLine("```html")
-                                .AppendLine(element)
-                                .Append("```")
-                                .ToString();
+                    .AppendLine(script)
+                    .AppendLine(element)
+                    .AppendLine("```html")
+                    .AppendLine(element)
+                    .Append("```")
+                    .ToString();
             }
         }
     }
@@ -133,28 +136,27 @@
         }
     }
 
+
     private static string FormatLargeNumber(long num)
     {
         return (num >= 100000000)
-            ? $"{num / 100000000:F1}亿"
+            ? $"{num / 100000000d:F1}亿"
             : (num >= 10000)
-                ? $"{num / 10000:F1}万"
+                ? $"{num / 10000d:F1}万"
                 : num.ToString();
     }
 
     private static string FormatSecondsToTime(long second)
     {
         TimeSpan time = TimeSpan.FromSeconds(second);
-        int sec = time.Seconds;
-        int min = time.Minutes;
-        int hour = time.Hours;
-        List<int> times = new(3);
+        StringBuilder builder = new();
+        ulong hour = (ulong)time.TotalHours;
         if (hour > 0)
         {
-            times.Add(hour);
+            _ = builder.Append(hour.ToString("D2")).Append(':');
         }
-        times.Add(min);
-        times.Add(sec);
-        return string.Join(":", times.Select(n => n.ToString("D2")));
+        _ = builder.Append(time.Minutes.ToString("D2")).Append(':')
+                   .Append(time.Seconds.ToString("D2"));
+        return builder.ToString();
     }
 }
diff --git a/Wherlog/wwwroot/js/highlight-extensions.js b/Wherlog/wwwroot/js/highlight-extensions.js
index 76413cc..7c55d2a 100644
--- a/Wherlog/wwwroot/js/highlight-extensions.js
+++ b/Wherlog/wwwroot/js/highlight-extensions.js
@@ -16,9 +16,9 @@ highlight.onload = () => {
     // Switch highlight Dark/Light theme
     const theme = document.querySelector('fluent-design-theme');
     if (theme != null) {
-        theme.addEventListener('onchange', (e) => {
+        theme.addEventListener('onchange', e => {
             if (e.detail.name == 'mode') {
-                if (e.detail.newValue === 'undefined') return;
+                if (e.detail.newValue === 'undefined') { return; }
                 const isDark = e.detail.newValue.includes('dark');
                 hljs_ColorSwitcher(isDark);
             }
@@ -27,7 +27,7 @@ highlight.onload = () => {
 
     // Detect system theme changing
     window.matchMedia('(prefers-color-scheme: dark)')
-        .addEventListener('change', (e) => {
+        .addEventListener('change', _ => {
             hljs_ColorSystem();
         });
 
diff --git a/Wherlog/wwwroot/js/loading-theme.js b/Wherlog/wwwroot/js/loading-theme.js
index e689fdc..3095d40 100644
--- a/Wherlog/wwwroot/js/loading-theme.js
+++ b/Wherlog/wwwroot/js/loading-theme.js
@@ -3,7 +3,6 @@
 // When it is, we'll remove this invisibility from the body.
 
 class LoadingTheme extends HTMLElement {
-
     className = "hidden-body";
     defaultDarkColor = "#272727";
     defaultLightColor = "#fbfbfb";
@@ -17,7 +16,6 @@ class LoadingTheme extends HTMLElement {
 
     // Custom element added to page.
     connectedCallback() {
-
         // If LocalStorage is not available, do nothing.
         if (localStorage == null) {
             return;
@@ -49,7 +47,7 @@ class LoadingTheme extends HTMLElement {
 
         // Create a ".hidden-unstyled-body" class
         // where the background-color is dark or light.
-        var css = `.${this.className} { visibility: hidden; background-color: ${bgColor}; }`;
+        const css = `.${this.className} { visibility: hidden; background-color: ${bgColor}; }`;
 
         // Add a <style> element to the <head> element
         const head = document.head || document.getElementsByTagName('head')[0];
@@ -60,7 +58,6 @@ class LoadingTheme extends HTMLElement {
 
         document.body.classList.add(this.className);
 
-
         // Add a <fluent-design-theme mode="dark|light" /> sub-element
         // Do not add the "storage-name"" to avoid unwanted local storage.
         const designTheme = document.createElement("fluent-design-theme");
@@ -76,9 +73,9 @@ class LoadingTheme extends HTMLElement {
     }
 
     // Attributes has changed.
-    attributeChangedCallback(name, oldValue, newValue) {
-
-    }
+    attributeChangedCallback(name, oldValue, newValue) { }
 }
 
-customElements.define("loading-theme", LoadingTheme);
+if (!customElements.get("loading-theme")) {
+    customElements.define("loading-theme", LoadingTheme);
+}