update

dom/修改平台logo.md

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+# 修改平台LOGO
+## js
+```
+// 顶部区域shortcut为"dec.header"
+BI.Plugin.registerObject("dec.header", function (widget) {
+//  取到logo对应的dom元素
+var logo = widget.element.find("img");
+//  添加类名
+logo.addClass("plugin-logo");
+});
+```
+## css
+```
+.plugin-logo {
+  cursor: pointer;
+  transform: rotate(0deg);
+  transition: transform .3s ease;
+}
+
+.plugin-logo:hover {
+  width: 30px !important;
+  height: 30px !important;
+  transform: rotate(180deg);
+  transition: transform .3s ease;
+}
+```
+
+## 效果
+![](../screenshorts/1.gif)

dom/修改平台标题.md

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+# 修改平台标题
+js
+```
+// 顶部区域shortcut为"dec.header"
+BI.Plugin.registerObject("dec.header", function (widget) {
+    //  创建一个<a>标签
+    var link = $("<a class='plugin-title' href=\"http://www.w3school.com.cn\">点击跳转到w3school</a>");
+    //  替换掉平台原有文字标题
+    var left = widget.element.children();
+    link.replaceAll(left.children()[1]);
+});
+```
+
+css
+```
+.plugin-title {
+  font-size: 20px;
+  display: block;
+  text-decoration: none;
+  color: bisque;
+}
+```

dom/增加一个footer.md

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+# 增加一个footer
+## js
+```
+//  为平台增加一个footer
+BI.Plugin.registerObject("dec.app", function (widget) {
+    //  首先创建一个footer
+    var footer = $("<div class=\"plugin-footer\">Copyright © 2006-2019 Fanruan.   </div>");
+    footer.css({
+        position: "absolute",
+        bottom: 0,
+        left: 0,
+        right: 0,
+        height: 30,
+        backgroundColor: "#2C3D59",
+        color: "white",
+        textAlign: "center"
+    });
+    //  添加到页面中
+    widget.element.append(footer);
+
+    //  将主内容区的bottom值设为30
+    var mainContent = widget.element.children().eq(0);
+    mainContent.css({
+        bottom: 30
+    });
+});
+```
+
+## 效果预览
+![](../screenshorts/2.png)

dom/隐藏侧边栏.md

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+# 隐藏侧边栏
+## js
+```
+//  首先把侧栏隐藏掉
+BI.Plugin.registerObject("dec.menu", function (widget) {
+    widget.element.hide();
+});
+//  然后再把body的left值设为0
+BI.Plugin.registerObject("dec.body", function (widget) {
+    widget.element.css("left", 0);
+});
+```