refactor(diy-group): simplify topNavColor and setPagestyle logic

remove redundant null checks for diyData and diyGlobalData, streamline the conditional branches for better readability

components-diy/diy-group.vue

@@ -300,21 +300,20 @@ export default {
 	computed: {
 		topNavColor() {
 			var color = '';
-			if (this.diyData && this.diyData.global && this.diyData.global.topNavBg) {
+			if (this.diyData.global.topNavBg) {
 				color = 'transparent';
 				if (this.scrollTop > 20) {
 					color = this.diyData.global.topNavColor;
 				} else {
 					color = 'transparent';
 				}
-			} else if (this.diyData && this.diyData.global) {
+			} else {
 				color = this.diyData.global.topNavColor;
 			}
 			return color;
 		},
 		// 修改属性样式
 		setPagestyle() {
-			if (!this.diyGlobalData || !this.diyGlobalData.value) return [];
 			this.diyGlobalData.value.forEach((item, index) => {
 				item.pageStyle = '';
 				// 给每个组件增加位置属性，用于定位，搜索、分类导航等定位