fix(data-table): spin style penetration (#662)

* fix(data-table): spin style penetration

* Update CHANGELOG.en-US.md

* Update CHANGELOG.zh-CN.md

Co-authored-by: Jiwen Bai <56228105@qq.com>
Co-authored-by: Yugang Cao <34439652+Talljack@users.noreply.github.com>

CHANGELOG.en-US.md

@@ -1,5 +1,11 @@
 # CHANGELOG
 
+## Pending
+
+### Fixes
+
+- Fix `n-data-table` the style penetration of the `n-spin`, closes[#663](https://github.com/TuSimple/naive-ui/issues/663).
+
 ## 2.15.7 (2021-07-25)
 
 ### Feats

CHANGELOG.zh-CN.md

@@ -1,5 +1,9 @@
 # CHANGELOG
 
+### Fixes
+
+- 修复 `n-data-table` `n-spin`的样式穿透问题，关闭　[#663](https://github.com/TuSimple/naive-ui/issues/663)
+
 ## 2.15.7 (2021-07-25)
 
 ### Feats

src/data-table/src/styles/index.cssr.ts

@@ -82,7 +82,8 @@ export default c([
         ])
       ])
     ]),
-    cB('base-loading', `
+    c('>', [
+      cB('base-loading', `
       color: var(--loading-color);
       font-size: var(--loading-size);
       position: absolute;
@@ -91,9 +92,10 @@ export default c([
       transform: translateX(-50%) translateY(-50%);
       transition: color .3s var(--bezier);
     `, [
-      fadeInScaleUpTransition({
-        originalTransform: 'translateX(-50%) translateY(-50%)'
-      })
+        fadeInScaleUpTransition({
+          originalTransform: 'translateX(-50%) translateY(-50%)'
+        })
+      ])
     ]),
     cB('data-table-expand-trigger', 'cursor: pointer;'),
     cB('data-table-expand-placeholder', `