Refactor code structure and remove redundant changes

assets/scss/mixins.scss

@@ -0,0 +1,9 @@
+//文字溢出...
+@mixin ellipsis($line: 1) {
+  word-break: break-all;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  display: -webkit-box !important;
+  -webkit-line-clamp: $line;
+  -webkit-box-orient: vertical;
+}