实现markdown编辑器

views/widgets/ie.tpl

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+<!--[if lte IE 8]>
+<div class="m-browsehappy">
+    <div class="browsehappy-inner">
+        <h3 class="title">对不起！<br>您的浏览器版本太低，请升级你的浏览器</h3>
+        <p class="suggest">建议使用：</p>
+        <p class="brower">
+                    <span class="item">
+                        <a class="ie image" href="https://www.microsoft.com/en-us/download/internet-explorer.aspx" target="_blank" title="下载Internet Explorer浏览器"></a>
+                        <b class="text">ie9+</b>
+                    </span>
+            <span class="item">
+                        <a class="chrome image" href="http://www.google.cn/intl/zh-CN/chrome/browser/?spm=1.7274553.0.0.benzR1" target="_blank" title="下载Chrome浏览器"></a>
+                        <b class="text">chrome</b>
+                    </span>
+        </p>
+        <p class="from">来自MinDoc的提醒</p>
+        <b class="browsehappy-arrow"></b>
+    </div>
+</div>
+<script>
+    window.nonsupportIE = true;
+</script>
+<![endif]-->