diff --git a/src/components/code-editor.vue b/src/components/code-editor.vue
index 84209bf..06f3985 100644
--- a/src/components/code-editor.vue
+++ b/src/components/code-editor.vue
@@ -36,6 +36,8 @@ export default {
 
   mounted() {
     let lang = this.lang
+    let firstLoad = true
+
     this.$last = this.code
 
     this.$view = new EditorView({
@@ -52,8 +54,9 @@ export default {
         // 监听代码变化
         EditorView.updateListener.of(v => {
           let value = v.state.doc.toString()
-          if (!this.$last || value.trim() === this.$last) {
+          if (firstLoad || value.trim() === this.$last) {
             this.$last = value.trim()
+            firstLoad = false
             return
           }
           this.$last = value.trim()
diff --git a/src/pages/playground/app.vue b/src/pages/playground/app.vue
index aa0fa67..7ed4518 100644
--- a/src/pages/playground/app.vue
+++ b/src/pages/playground/app.vue
@@ -55,9 +55,9 @@ export default {
           } catch (e) {}
         }
 
-        this.html = code.html
-        this.js = code.js
-        this.css = code.css
+        this.html = code.html || ''
+        this.js = code.js || ''
+        this.css = code.css || ''
         this.updatePreview()
       }
       this.$needUpdate = true
diff --git a/src/pages/playground/views/preview.vue b/src/pages/playground/views/preview.vue
index 67f107b..6b63a24 100644
--- a/src/pages/playground/views/preview.vue
+++ b/src/pages/playground/views/preview.vue
@@ -66,7 +66,7 @@ export default {
       // _time / 2000 * 100 %
       this.progress = ~~(_time / 10)
 
-      if (pending && _time > 1000) {
+      if (pending && _time >= 1000) {
         this.progress = 0
         let doc = this.$refs.view.contentDocument