add ts to demo

docs/index.html

@@ -48,7 +48,12 @@
                     <a class="item" href="./document/">Document</a>
                     <a class="item" href="https://github.com/zhw2590582/ArtPlayer">Github</a>
                 </div>
-                <div class="run">▶ Run Code</div>
+                <div class="tool">
+                    <div class="typeScript">
+                        <input type="checkbox" id="typeScript"><label for="typeScript">TypeScript ?</label>
+                    </div>
+                    <div class="run">▶ Run Code</div>
+                </div>
             </header>
             <div class="libs">
                 <textarea class="libsInput"