fix: use mcqAnswer.value in template delete handler

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/admin/tutorial/components/ExerciseManager.vue

@@ -24,7 +24,7 @@ const formOrder = ref(0)
 
 const mcqQuestion = ref("")
 const mcqOptions = ref(["", ""])
-const mcqAnswer = ref(0)
+const mcqAnswer = ref<number[]>([])
 
 const sortQuestion = ref("")
 const sortCode = ref("")
@@ -44,7 +44,7 @@ function openCreate() {
   formOrder.value = exercises.value.length
   mcqQuestion.value = ""
   mcqOptions.value = ["", ""]
-  mcqAnswer.value = 0
+  mcqAnswer.value = []
   sortQuestion.value = ""
   sortCode.value = ""
   fillQuestion.value = ""
@@ -60,7 +60,7 @@ function openEdit(ex: Exercise) {
     const d = ex.data as ExerciseMcqData
     mcqQuestion.value = d.question
     mcqOptions.value = [...d.options]
-    mcqAnswer.value = d.answer
+    mcqAnswer.value = [...d.answer]
   } else if (ex.type === "sort") {
     const d = ex.data as ExerciseSortData
     sortQuestion.value = d.question
@@ -73,6 +73,12 @@ function openEdit(ex: Exercise) {
   showForm.value = true
 }
 
+function toggleAnswer(i: number) {
+  const idx = mcqAnswer.value.indexOf(i)
+  if (idx === -1) mcqAnswer.value.push(i)
+  else mcqAnswer.value.splice(idx, 1)
+}
+
 async function save() {
   let data: Record<string, unknown>
   if (formType.value === "mcq") {
@@ -218,7 +224,7 @@ function typeTagType(type: string): "success" | "info" | "warning" {
               placeholder="下面选项中正确是哪个？"
             />
           </n-form-item>
-          <n-form-item label="选项（正确答案前选择单选按钮）">
+          <n-form-item label="选项（勾选所有正确答案）">
             <n-space vertical style="width: 100%">
               <n-flex
                 v-for="(opt, i) in mcqOptions"
@@ -226,10 +232,9 @@ function typeTagType(type: string): "success" | "info" | "warning" {
                 align="center"
                 :size="8"
               >
-                <n-radio
-                  :value="i"
-                  :checked="mcqAnswer === i"
-                  @update:checked="$event && (mcqAnswer = i)"
+                <n-checkbox
+                  :checked="mcqAnswer.includes(i)"
+                  @update:checked="toggleAnswer(i)"
                 />
                 <n-input
                   v-model:value="mcqOptions[i]"
@@ -242,8 +247,9 @@ function typeTagType(type: string): "success" | "info" | "warning" {
                   @click="
                     () => {
                       mcqOptions.splice(i, 1)
-                      if (mcqAnswer >= mcqOptions.length)
-                        mcqAnswer = mcqOptions.length - 1
+                      mcqAnswer.value = mcqAnswer.value
+                        .filter((a) => a !== i)
+                        .map((a) => (a > i ? a - 1 : a))
                     }
                   "
                 >

src/oj/learn/components/ExerciseMcq.vue

@@ -4,36 +4,53 @@ import { Exercise, ExerciseMcqData } from "utils/types"
 const props = defineProps<{ exercise: Exercise }>()
 const data = computed(() => props.exercise.data as ExerciseMcqData)
 
-const selected = ref<number | null>(null)
+const selected = ref<Set<number>>(new Set())
 const correct = ref(false)
 const wrong = ref(false)
+const partial = ref(false)
 
 function select(idx: number) {
   if (correct.value) return
-  selected.value = idx
+  const s = new Set(selected.value)
+  if (s.has(idx)) s.delete(idx)
+  else s.add(idx)
+  selected.value = s
   wrong.value = false
+  partial.value = false
 }
 
 function submit() {
-  if (selected.value === null || correct.value) return
-  if (selected.value === data.value.answer) {
+  if (selected.value.size === 0 || correct.value) return
+  const answer = new Set(data.value.answer)
+  const sel = selected.value
+  const isEqual =
+    sel.size === answer.size && [...sel].every((v) => answer.has(v))
+  if (isEqual) {
     correct.value = true
     wrong.value = false
+    partial.value = false
+  } else {
+    const hasIntersection = [...sel].some((v) => answer.has(v))
+    if (hasIntersection) {
+      partial.value = true
+      wrong.value = false
     } else {
       wrong.value = true
-    selected.value = null
+      partial.value = false
+    }
   }
 }
 
 function reset() {
-  selected.value = null
+  selected.value = new Set()
   correct.value = false
   wrong.value = false
+  partial.value = false
 }
 
 function optionType(idx: number): "default" | "primary" | "success" {
-  if (correct.value && idx === data.value.answer) return "success"
-  if (idx === selected.value) return "primary"
+  if (correct.value && data.value.answer.includes(idx)) return "success"
+  if (selected.value.has(idx)) return "primary"
   return "default"
 }
 </script>
@@ -46,7 +63,7 @@ function optionType(idx: number): "default" | "primary" | "success" {
     <template #header>
       <n-space align="center" :size="8">
         <n-tag type="success" size="small" :bordered="false"
-          >练一练 · 选择题</n-tag
+          >练一练 · 多选题</n-tag
         >
       </n-space>
     </template>
@@ -60,7 +77,7 @@ function optionType(idx: number): "default" | "primary" | "success" {
         :type="optionType(idx)"
         :secondary="optionType(idx) !== 'default'"
         :tertiary="optionType(idx) === 'default'"
-        :strong="idx === selected"
+        :strong="selected.has(idx)"
         :style="{
           justifyContent: 'flex-start',
           width: '100%',
@@ -78,9 +95,11 @@ function optionType(idx: number): "default" | "primary" | "success" {
     </n-space>
 
     <n-alert
-      v-if="correct || wrong"
-      :type="correct ? 'success' : 'error'"
-      :title="correct ? '正确！' : '选择有误，请重试'"
+      v-if="correct || wrong || partial"
+      :type="correct ? 'success' : partial ? 'warning' : 'error'"
+      :title="
+        correct ? '正确！' : partial ? '部分正确，请重试' : '选择有误，请重试'
+      "
       style="margin-top: 12px"
     />
 
@@ -88,7 +107,7 @@ function optionType(idx: number): "default" | "primary" | "success" {
       <n-button
         type="primary"
         size="small"
-        :disabled="selected === null || correct"
+        :disabled="selected.size === 0 || correct"
         @click="submit"
       >
         提交

src/utils/types.ts

@@ -582,7 +582,7 @@ export interface Tutorial {
 export interface ExerciseMcqData {
   question: string
   options: string[]
-  answer: number
+  answer: number[]
 }
 
 export interface ExerciseSortData {