change example link

static/index.html

@@ -26,7 +26,7 @@
         <div class="inner"><a class="logo" href="/">JsonBird</a>
             <nav id="nav">
                 <a href="/">首页</a>
-                <a href="https://jsfiddle.net/LNing/duL5Lby7/" target="_blank">示例</a>
+                <a href="http://jsrun.net/PriKp" target="_blank">示例</a>
                 <a href="#interface">数据接口</a>
                 <a href="/docs.html">接口文档</a>
                 <a href="https://github.com/xCss/JsonBird" target="_blank">Github</a>