修改按钮无法拖动高度的bug

src/components/Element/ButtonElement.vue

@@ -336,7 +336,8 @@
   .content {
     /*white-space: pre-wrap;*/
     word-wrap: break-word;
-    position: relative;
+    position: absolute;
+    top: 0;
     z-index: 3;
   }
 

src/model/Element.js

@@ -55,5 +55,6 @@ export default class Element {
     this.animatedFont = ele.animatedFont || ''
     this.eleCanvas = ele.eleCanvas || ''
     this.swiperType = ele.swiperType || 'mtswiper'
+    this.isFixed = ele.isFixed || false
   }
 }