✨ feat: 电子签名高度调整优化

 <!--
  * @Date: 2022-09-06 16:29:31
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2023-02-10 15:15:05
+ * @LastEditTime: 2023-02-10 15:31:06
  * @FilePath: /data-table/src/components/SignField/index.vue
  * @Description: 电子签名控件
 -->
@@ -78,7 +78,7 @@ onMounted(() => {
   // 动态计算画板canvas宽度/高度
   setTimeout(() => {
     esignWidth.value = wrapperRef.value.offsetWidth - 32;
-    esignHeight.value = (document.body.offsetHeight) / 5;
+    esignHeight.value = (window.innerHeight) / 5;
   }, 100);
 })
 const lineWidth = ref(6);