feat: add getLastQuestion function

Author: frant1c

src/pages/home.tsx

@@ -13,7 +13,7 @@ function Home() {
         loop: false,
         type: "text"
     })
-    const { getRandomQuestion, setQuestion } = useQsStore()
+    const { getRandomQuestion, setQuestion, getLastQuestion } = useQsStore()
     const handleFileChange = async (event: any) => {
         const file = event.target.files[0]
         if (!file) return
@@ -46,6 +46,10 @@ function Home() {
         await setNowQuestion(getRandomQuestion())
         setShowAnswer(false)
     }
+    const handleLastQuestion = async () => {
+        await setNowQuestion(getLastQuestion())
+        setShowAnswer(false)
+    }
     return (
         <>
             {upload ? (
@@ -61,7 +65,10 @@ function Home() {
                             <div className="text-white">{showAnswer ? "关闭" : "显示"}答案</div>
                         </div>
                         <div className="absolute top-[300px] flex flex-nowrap gap-[120px]">
-                            <div className="flex h-[40px] w-[80px] cursor-pointer items-center justify-center rounded-xl border-2 border-black/50 bg-gray-500">
+                            <div
+                                className="flex h-[40px] w-[80px] cursor-pointer items-center justify-center rounded-xl border-2 border-black/50 bg-gray-500"
+                                onClick={() => handleLastQuestion()}
+                            >
                                 <div className="text-white">上一题</div>
                             </div>
                             <div

src/store/question.ts

@@ -3,14 +3,16 @@ import { create } from "zustand"
 interface QsStore {
     question: [string, string][]
     lastIndex: number
+    nowIndex: number
     setQuestion: (qsString: string) => void
     getRandomQuestion: () => [string, string]
+    getLastQuestion: () => [string, string]
 }
 
 const useQsStore = create<QsStore>((set, get) => ({
     question: [],
     lastIndex: -1,
-
+    nowIndex: -1,
     setQuestion: (qsString: string) => {
         if (!qsString?.trim()) {
             console.warn("setQuestion: 输入必须是非空字符串")
@@ -49,12 +51,25 @@ const useQsStore = create<QsStore>((set, get) => ({
     getRandomQuestion: () => {
         const questions = get().question
         const count = questions.length
+        if (get().lastIndex !== get().nowIndex) {
+            get().lastIndex = get().nowIndex
+        }
+
         let randomIndex = Math.floor(Math.random() * count)
         while (randomIndex === get().lastIndex) {
             randomIndex = Math.floor(Math.random() * count)
         }
+        get().nowIndex = randomIndex
         console.log(questions[randomIndex])
         return questions[randomIndex]
+    },
+    getLastQuestion: () => {
+        const questions = get().question
+        const lastIndex = get().lastIndex
+        get().nowIndex = lastIndex
+        console.log("last", lastIndex)
+        console.log("lastquestion:", questions[lastIndex])
+        return questions[lastIndex]
     }
 }))