switch screen size.

src/shared/composables/switchScreen.ts

@@ -0,0 +1,17 @@
+import { ScreenMode } from "~/utils/constants"
+
+export const screenMode = ref(ScreenMode.both)
+
+export const screenSwitchLabel = computed(() => {
+  if (screenMode.value === ScreenMode.both) return "题目 | 代码"
+  else if (screenMode.value === ScreenMode.problem) return "仅题目"
+  return "仅代码"
+})
+
+export function switchScreenMode() {
+  if (screenMode.value === ScreenMode.both) {
+    screenMode.value = ScreenMode.problem
+    return
+  }
+  screenMode.value += 1
+}