添加一个简单的自定义方法查询功能

pages/custommethod.md

@@ -93,6 +93,18 @@
 ## 快捷查询
 
 <div class="custommethods-search">
+  <div class="cm-search">
+    <input class="cm-query" type="text" placeholder="输入自定义方法名，如 ChangeCharacter" autocomplete="off">
+    <ul class="cm-suggest"></ul>
+  </div>
+  <div class="cm-selected" hidden>
+    <div class="cm-head">
+      <span class="cm-name"></span>
+      <span class="cm-desc"></span>
+    </div>
+    <div class="cm-row"></div>
+    <code class="cm-preview"></code>
+  </div>
 </div>
 
 ## 我知道你还想问什么