---
tags: JS 直播班 - 2022 秋季班
---
# 🏅 Day 21 - DOM 選擇器

這週我們學到 querySelector 這個強大的選擇器，它會回傳它在網頁 document 中所找到的 **「第一個」** 符合設定的元素，在 HTML 中由上而下開始找。

請同學依照下方練習，並回答問題。

### querySelector 選取方式

1. 可以直接選取 HTML 元素

HTML:

    <!-- querySelector 只會回傳第一個符合選取條件的元素 -->
    <p>我被 el 選到了</p>  
    <p>我沒有被選到</p>

JS:

    const el = document.querySelector("p");

2. 可以選取帶有 id 或 class 的元素

HTML:

    <p id="targetID">我被 elementID 選到了</p>
    <p class="targetClass">我被 elementClass 選到了</p>

JS:

    const elementID = document.querySelector("#targetID");
    const elementClass = document.querySelector(".targetClass");

3. 可以用類似 CSS 的撰寫方式選取

HTML:

    <div id="targetID">
      <p>我被 elementID 選取到了</p>
    </div>
    <!-- 以下是 span 被選取到 -->
    <div class="targetClass">
      <p>
        <span>我被 elementClass 選取到了</span>
      </p>
    </div>

JS:

    const elementID = document.querySelector("#targetID p");
    const elementClass = document.querySelector(".targetClass > p > span");

問題
---
請同學練習用上述第 2、3 個方法選取下方程式碼中的 p 標籤

HTML

<!-- 第一題，請選取以下 p 標籤 -->
<p id="targetID">請選取我</p>

<!-- 第二題，請選取以下 p 標籤 -->
<p class="targetClass">請選取我</p>

<!-- 第三題，請選取以下第二個 p 標籤 -->
<div class="targetAElementP">
  <p>請不要選取我</p>
</div>
<div class="targetBElementP">
  <p>請選取我</p>
</div>

## 回報流程

將答案寫在 CodePen 並複製 CodePen 連結貼至底下回報就算完成了喔!
解答位置請參考下圖（需打開程式碼的部分觀看）


<!-- 解答：

const targetID = document.querySelector("#targetID");
const targetClass = document.querySelector(".targetClass");
const targetBElementP = document.querySelector(".targetBElementP p");
-->

回報區
---

| Discord | CodePen / 答案 |
|:----------------:|:--------------------------------------------------------------------------------:|
| 嗶嗶羊#8042 | [Codepen](https://codepen.io/mazizlte-the-typescripter/pen/MWXyVrz?editors=1011) |
| masterYan#2480 | [Codepen](https://codepen.io/htzwgoqt-the-looper/pen/RwJWOoY?editors=1011) |
| hsiung阿熊#4079 | [Codepen](https://codepen.io/hsiungchi/pen/RwJWywB) |
| YC#2522 | [CodePen](https://codepen.io/YCLu/pen/jOKbxEO) |
| CloThEs#7837 | [Codepen](https://codepen.io/CloThEsZ/pen/ExRVLaW) |
| azami#5986 | [Codepen](https://codepen.io/azami/pen/zYavjYN) |
| 圈圈#4060 | [Codepen](https://codepen.io/whejfczn-the-bold/pen/QWxjryW) |
| Hironaka#7367 | [Codepen](https://codepen.io/Hironaka0815/pen/JjZYvKO) |
| hannahTW#2224 | [Codepen](https://codepen.io/hangineer/pen/PoaPeZV?editors=1111) |
| Eileen#6454 | [Codepen](https://codepen.io/Eileen-io/pen/rNKOvWj) |
| Data#9297 | [Codepen](https://codepen.io/kirakira72/pen/zYavjKw) |
| KC_8685#9343 | [Codepen](https://codepen.io/cathy7411/pen/abKvGZy) |
| 威0#6919 | [codepen](https://codepen.io/n0918679182/pen/PoaPebL?editors=1011) |
| yoshidc#0455 | [codepen](https://codepen.io/yoshiyyc/pen/ZERboKB) |
| Clara#1275 | [codepen](https://codepen.io/bsupixqu/pen/poKjVPy?editors=1111B) |
| albee#9121 | [Codepen](https://codepen.io/albee-chang/pen/MWXaGoj?editors=1011) |
| VT#0895 | [Codepen](https://codepen.io/vt197/pen/BaVoxdX) |
| 芮綺#5224 | [Codepen](https://codepen.io/zhan70/pen/KKedRgd?editors=1011) |
| Winnie#1306 | [Codepen](https://codepen.io/WinnieWuWinnie/pen/ZERbove?editors=1011) |
| 無名#6427 | [Codepen](https://codepen.io/Nomoney/pen/jOKbxwb?editors=1010) |
| 楓之聲#6945 | [Codepen](https://codepen.io/sshane258/pen/ExRVLEo) |
| 薯餅#3581 | [Codepen](https://codepen.io/ColdingPoTaTo/pen/poKjVaE) |
| Chung#5951 | [Codepen](https://codepen.io/yuju16/pen/dyKYemg?editors=1011) |
| JackC#0411 | [Codepen](https://codepen.io/key0329/pen/vYrNjjb) |
| 威爾#1694 | [CodePen](https://codepen.io/WILL_Wu/pen/BaVoxqy) |
| AuroraC#6539 | [codepen](https://codepen.io/AuroraC/pen/MWXaGqm?editors=1011) |
| 法希娜#3206 | [codepen](https://codepen.io/yiiserpf-the-encoder/pen/wvXKjOK?editors=1010) |
| 艸良#2846 | [codepen](https://codepen.io/momoninainai/pen/vYrNjPw) |
| kenki100#0068 | [codepen](https://codepen.io/ken100/pen/xxzwjBJ) |
| Peng#9811 | [codepen](https://codepen.io/peng-027/pen/LYrpmvX) |
| kuku#3118 | [Codepen](https://codepen.io/mengting-ku/pen/JjZYZde) |
| 出事了阿伯#9923 | [Codepen](https://codepen.io/BradpittLai/pen/mdKeKbb?editors=1011) |
| jacky010080#0880 | [CodePen](https://codepen.io/Yen-Jung-Chen/pen/MWXaXaO?editors=1010) |
| Benson#6763 | [Codepen](https://codepen.io/kumashow/pen/RwJWJrw) |
| RJRS#9430 | [CodePen](https://codepen.io/RJRS/pen/WNyQyQR) |
| amy芳#1385 | [Codepen](https://codepen.io/amy-chieng/pen/poKjKbW) |
| Hazel.#6020 | [codepen](https://codepen.io/Hazelhsieh/pen/bGKVMpP?editors=1011) |
| yumy#1940 | [Codepen](https://codepen.io/yumy_yamg/pen/XWYmYjB) |
| 心幻羽#0056 | [Codepen](https://codepen.io/linglingsyu/pen/jOKbKVL) |
| yawun#0042 | [CodePen](https://codepen.io/monicalin/pen/Vwdvdmo) |
| 大衛#4869 | [CodePen](https://codepen.io/exnsrpjc/pen/GRGpGBj?editors=1010) |
| Cookie SSS#6991 | [CodePen](https://codepen.io/sqhjikpa-the-selector/pen/jOKbKvz?editors=1011) |
| Ryan Chiang#6649 | [Codepen](https://codepen.io/ryanchiang/pen/QWxjBLx?editors=1011) |
| PayRoom#8328 | [CodePen](https://codepen.io/water38198/pen/KKedBpG) |
| 粉蒸肉#6214 | [Codepen](https://codepen.io/wrightyu/pen/rNKOrOE?editors=1011) |
| WEI_RIO#9342 | [codepen](https://codepen.io/wei_wu/pen/abKvjNz?editors=1011) |
| JustinLiu#9699 | [CodePen](https://codepen.io/justin0227/pen/MWXaBex?editors=1010) |
| Ayre#0016 | [Codepen](https://codepen.io/yichunlin09/pen/QWxjBdZ?editors=1010) |
| 末次#0236 | [Codepen](https://codepen.io/yunjulee/pen/WNyQKZY) |
| Sentiments#4883 | [codepen](https://codepen.io/Sentiments/pen/JjZYBBb?editors=1011) |
| Potatolee#7749 | [codepen](https://codepen.io/potatoleee/pen/YzvyjJE) |
| shinyhung#3825 | [codepen](https://codepen.io/sean_1215/pen/yLEYqWy?editors=1111) |
| 教練#6451 | [codepen](https://codepen.io/monkeybear721/pen/wvXKxVO?editors=1011) |
| RyanTsai#8906 | [CodePen](https://codepen.io/linlaose/pen/oNyjPWd) |
| YI#0863 | [CodePen](https://codepen.io/YI0305/pen/xxzwaqP?editors=0012) |
| LHchien33#6232 | [CodePen](https://codepen.io/lin_chien/pen/ZERbMLp?editors=1011) |
| Vera#5592 | [CodePen](https://codepen.io/skvera/pen/rNKOZdw) |
| 勁辣雞腿寶#5817 | [Codepen](https://codepen.io/orz311013/pen/wvXKEmv) |
| 黑白兔#0684 | [Codepen](https://codepen.io/johnny329/pen/poKjOBe) |
| banazita#5143 | [CodePen](https://codepen.io/banazita/pen/MWXaqNE?editors=1111) |
| 0xWilliam #8796 | [CodePen](https://codepen.io/0xWilliam0322/pen/RwJWeWb?editors=0011) |
| Kimi #9564 | [Codepen](https://codepen.io/kimihu91/pen/WNyQaeo) |
| SASIMI#5099 | [Codepen](https://codepen.io/sashimi1327/pen/JjZYmJz) |
| 肉桂卷#0625 | [Codepen](https://codepen.io/ginnlee/pen/eYKpPrP?editors=1012) |
| 雷雷#7844 | [Codepen](https://codepen.io/lei-yi-jie/pen/GRGpYQq) |
| Kevin#6131 | [Codepen](https://codepen.io/xlqjezvc-the-encoder/pen/ZERbmEw?editors=1011) |
| Jenny真#7532 | [CodePen](https://codepen.io/wei-chen-wu/pen/jOKbQog?editors=0010) |
| Greta#0837 | [CodePen](https://codepen.io/gretali/pen/ZERbVaL) |
| jackson204#6363 | [CodePen](https://codepen.io/jackson204/pen/KKedbrN) |
| Hilda#7085 | [CodePen](https://codepen.io/vwquikad-the-vuer/pen/GRGpeKW) |
| Ruby Chen#7452 | [CodePen](https://codepen.io/ruby92429/pen/gOKaEax?editors=1111) |
| Amberhh#2465 | [Codepen](https://codepen.io/Amberhh/pen/XWYmBgW?editors=0010) |
| 黃士桓#7654 | [codePen](https://codepen.io/shr-huan-huang/pen/Yzvygvx) |
| cbs#9007 | [Codepen](https://codepen.io/wasdjk/pen/vYrNPzW) |
| 蓁心#6229 | [Codepen](https://codepen.io/tlorfrnl-the-typescripter/pen/KKedYKP?editors=1011) |
| William Lai#0196 | [Codepen](https://codepen.io/lai-weihan/pen/PoaPgXY) |
| Rena#6249 | [Codepen](https://codepen.io/aureate0116/pen/jOKboLG?editors=0010) |
| mou#2215 | [Codepen](https://codepen.io/shihchiehlan/pen/WNyQBpj?editors=1010) |
| 萱仔#0781 | [Codepen](https://codepen.io/ting-hsuan/pen/vYrNMXa?editors=1010) |
| 安o#2448 | [Codepen](https://codepen.io/JzhenAn/pen/dyKYBdv?editors=1011) |
| 竹輪#3335 | [Codepen](https://codepen.io/chikuwa0120/pen/JjZYgNO) |
| bingsu#2362 | [Codepen](https://codepen.io/pmyfr/pen/ExRVqWX?editors=0010) |
| Lucie#3831 | [Codepen](https://codepen.io/bisespei/pen/YzvyobY) |
| sophiee#7015 | [codepen](https://codepen.io/sophiee2727/pen/BaVjBWz?editors=1111) |
| jimmyFang#9575 | [codepen](https://codepen.io/pohxiqqo/pen/wvXMwXd?editors=1010) |
| 王懷英#7271 | [codepen](https://codepen.io/huaiying/pen/YzvwWgr) |
| mandylai#4055 | [codepen](https://codepen.io/mandy-lai-2/pen/KKeVgZd?editors=1011) |
| 予予#9627 | [codepen](https://codepen.io/kiqzcraa/pen/YzvwGjJ?editors=1111) |
| Mylène#2481 | [Codepen](https://codepen.io/hamajibashi/pen/VwdeKVE) |
| christina#6185 | [Codepen](https://codepen.io/chrisc0210/pen/WNyrobx) |
| yaru#6308 | [Codepen](https://codepen.io/lszaietc/pen/RwJroob) |
| Loran #1105 | [Codepen](https://codepen.io/loranlin/pen/WNyrxMa) |
| Yiru#0236 | [Codepen](https://codepen.io/yiru94/pen/QWxydGB?editors=1011) |
| hungya#0773 | [Codepen](https://codepen.io/hungya777/pen/qBKbRVZ?editors=0011) |
| IreneY#0086 | [codepen](https://codepen.io/HalfPlannedJourney/pen/eYKJgXm) |
| beta lin#1445 | [CodePen](https://codepen.io/linbeta/pen/yLEebEv) |
| 我是泇吟#5189 | [CodePen](https://codepen.io/kljuqbxs/pen/BaVjdZE) |
| 哈囉哈#5196 | [CodePen](https://codepen.io/bill0841205/pen/OJEMxRy?editors=1011) |
| shio#1414 | [CodePen](https://codepen.io/shioyen/pen/JjZGrvz?editors=1111) |
| yoyo#1003 | [CodePen](https://codepen.io/crpbugqy-the-typescripter/pen/jOKWGKG?editors=1111) |
| CofCat#9226 | [CodePen](https://codepen.io/cofcat456/pen/jOKWJXX?editors=1111) |
| 魚子醬#5220 | [CodePen](https://codepen.io/haihsuan/pen/YzvwoRV?editors=1111) |
| 柔柔#1716 | [Codepen](https://codepen.io/rouchen/pen/mdKVNex?editors=1111) |
| Ron Liang#7277 | [Codepen](https://codepen.io/ron-go/pen/yLEOLMR) |
| 母湯#7211 | [Codepen](https://codepen.io/tommyshih77/pen/dyKoJWQ?editors=1011) |
| Silvialu#4521 | [Codepen](https://codepen.io/Silvia091640/pen/xxzVGjQ) |
| Judy Wei#6103 | [Codepen](https://codepen.io/Judy0718/pen/bGKpVdr) |
| yen #5757 | [Codepen](https://codepen.io/TZU-HUANG-YEN/pen/oNdPgqY?editors=0011) |
| kancheng#3915 | [CodePen](https://codepen.io/kancheng/pen/rNKemxz?editors=1111) |
| Rr#2215 | [Codepen](https://codepen.io/rufangcheng/pen/QWxNVQX) |
| suihsilan#9485 | [CodePen](https://codepen.io/suihsilan/pen/YzvqagN?editors=1010) |
| Paul#7426 | [CodePen](https://codepen.io/paul-1997/pen/QWxNVrX?editors=1011) |
|軟綿綿 (๑•ᴗ•๑) ♡#3627|[CodePen](https://codepen.io/Connie-Chien/pen/rNKeqbv?editors=0011)|
| 小白#2406 | [CodePen](https://codepen.io/gracewhite/pen/RwJRoaq) |
|Azi Hsieh#2861|[CodePen](https://codepen.io/AziHsieh/pen/KKeMNOq)|
| m_m#5493 | [CodePen](https://codepen.io/minnn7716/pen/jOKrmRB) |
|Tami#6742|[CodePen](https://codepen.io/wqsdqbjn-the-vuer/pen/mdKEwQO)|
|黑松胖#4836|[Codepen](https://codepen.io/yi-chien-hsieh/pen/MWXeQmb?editors=0012)|
|健育#5748|[Codepen](https://codepen.io/c1317156/pen/qBKNGNV)|
|Cynrhia1111#1822|[Codepen](https://codepen.io/Cynthia1111/pen/NWzrVzq)|
|PoWei#8484|[Codepen](https://codepen.io/harrison-wei-lai/pen/Poazrqq?editors=1011)|
|How#5806|[Codepen](https://codepen.io/howtobefine/pen/PoaGYzX?editors=1111)
|poetry1933#2713|[Codepen](https://codepen.io/poetry1932/pen/JjZRKMz?editors=1111)|
|Cream#3449|[Codepen](https://codepen.io/frxdwbbi-the-sasster/pen/QWxKdoa?editors=1011)|
|Tuhacrt#0008|[codepen](https://codepen.io/Tuhacrt/pen/GRGjLvm)|
|Yuna Huang#2692|[codepen](https://codepen.io/Yuna1002/pen/ZERBQpm?editors=1011)|
|Shuo#1596|[codepen](https://codepen.io/chiangchungshuo/pen/MWXbepo)|
|ling chang#1024|[codepen](https://codepen.io/ling-chang/pen/oNyYpYN)|
|charlottelee849#0366|[codepen](https://codepen.io/charlotte-lee/pen/GRGNQjx?editors=1011)|
|L0F0#8733|[codepen](https://codepen.io/l0f0/pen/XWYNEqE?editors=0011)|
|三隻小貓#1905|[CodePen](https://codepen.io/bagelover/pen/ZERBrQz?editors=1011)|
|Lou#0085|[CodePen](https://codepen.io/Lusie_H/pen/wvXoOEG?editors=1011)|
|Yishan#4902|[CodePen](https://codepen.io/gdjrehhw-the-animator/pen/GRGrNQd?editors=1011)|
|Wei#2330|[Codepen](https://codepen.io/ixfjxrbo-the-typescripter/pen/PoaWWVw)|
|Velma#1693|[codepen](https://codepen.io/Ze1225/pen/NWzdgaq)|
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