fix: nodeKey slot missing span tag.

Author: leezng

example/Basic.vue

@@ -72,9 +72,9 @@
       >
         <template v-if="useNodeKeySlot" #nodeKey="{ node, defaultKey }">
           <template v-if="node.key === 'title'">
-            <a>"{{ node.key }}":</a>
+            <a>"{{ node.key }}"</a>
           </template>
-          <template v-else>{{ defaultKey }}:</template>
+          <template v-else>{{ defaultKey }}</template>
         </template>
 
         <template v-if="useNodeValueSlot" #nodeValue="{ node, defaultValue }">

src/components/TreeNode/index.vue

@@ -33,9 +33,10 @@
       <carets v-if="showIcon" :node-type="node.type" @click="handleIconClick" />
     </div>
 
-    <slot v-if="node.key" name="key" :node="node" :defaultKey="prettyKey">
-      <span class="vjs-key">{{ prettyKey }}:</span>
-    </slot>
+    <span v-if="node.key" class="vjs-key">
+      <slot name="key" :node="node" :defaultKey="prettyKey">{{ prettyKey }}</slot>
+      <span>:</span>
+    </span>
 
     <span>
       <brackets v-if="node.type !== 'content'" :data="node.content" @click="handleBracketsClick" />