# 🏅 6/9 (三) 每日任務 Day 33
###### tags: `Vue 直播班 - 2021 夏季班`

題目 (請將答案貼上 CodePen)
---
操作 [這個模板](https://codepen.io/rider159159/pen/VwpbrJo)，執行以下要求 (只能操作 JS 的部分):

> 使用 watch 監控 props
> - 請在 new-input 元件的 watch 中監控 props 傳來的值，讓下方 input 和上方 input 顯示相同數值。
> - 此次練習主要目的，是讓同學瞭解單向數據流的特性，無法直接修改 props 的值。

參考: https://ithelp.ithome.com.tw/articles/10219200

回報流程
---
請同學依照下圖教學觀看解答、回報答案:


回報格式如下圖，請在「回報區」使用註解回報答案 (為了統計人數，請同學依序加上「報數」)


<!-- 解答
app.component('new-input', {
props: ['propCash'],
data() {
return {
cash: 0,
}
},
template: `<input type="number" v-model="cash"/>`,
watch: {
propCash() {
this.cash = this.propCash;
}
}
});
-->

回報區
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<!--1:Alpha
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<!--2:小魚
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https://codepen.io/ericadu/pen/JjWBZMK
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codepen: https://codepen.io/MINN3/pen/oNZMMYq
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https://codepen.io/vicky-chang/pen/bGqmjMZ?editors=1011
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https://codepen.io/pohxiqqo/pen/zYZMBvY
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