寫項目的時候發現小程序沒有自帶的彈窗輸入的組件，只能自己寫一個。

1.半透明的遮蓋層

遮蓋層的樣式和顯隱事件
wxml代碼：

<view class="body">
  <button bindtap='eject'>彈窗</button>
</view>
<view class="model" catchtouchmove='preventTouchMove' wx:if='{{showModal}}'></view>

wxss代碼：

.model{
  position: absolute;
  width: 100%;
  height: 100%;
  background: #000;
  z-index: 999;
  opacity: 0.5;
  top: 0;
  left:0;
}

js代碼：

 /**
   * 頁面的初始數據
   */
  data: {
    showModal: false,
  },

  /**
   * 控制遮蓋層的顯示
   */
  eject:function(){
    this.setData({
      showModal:true
    })
  }

2.彈窗窗口實現

彈窗窗口的樣式和顯隱事件
wxml代碼：

<view class="modalDlg" catchtouchmove='preventTouchMove' wx:if='{{showModal}}'>
  <view class='windowRow'>
    <text class='userTitle'>標題
  </text>
    <view class='back' bindtap='back'>
      返回
    </view>
  </view>
  <view class='wishName'>
    <input bindinput='wish_put' placeholder='請輸入內容' class='wish_put'></input>
  </view>
  <view class='wishbnt'>
    <button class='wishbnt_bt' bindtap='ok'>確定</button>
  </view>
</view>

wxss代碼：

.modalDlg{
  width: 70%;
  position: fixed;
  top:350rpx;
  left: 0;
  right: 0;
  z-index: 9999;
  margin: 0 auto;
  background-color: #fff;
  border-radius: 10rpx;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.windowRow{
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  height: 110rpx;
  width: 100%;
}

.back{
  text-align: center;
  color: #f7a6a2;
  font-size: 30rpx;
  margin: 30rpx;
}

.userTitle{
  font-size: 30rpx;
  color: #666;
  margin: 30rpx;
}

.wishName{
  width: 100%;
  justify-content: center;
  flex-direction: row;
  display: flex;
  margin-bottom: 30rpx;
}

.wish_put{
  width: 80%;
  border: 1px solid;
  border-radius: 10rpx;
  padding-left: 10rpx;
}

.wishbnt{
  width: 100%;
  font-size: 30rpx;
  margin-bottom: 30rpx;
}


.wishbnt_bt{
  width: 50%;
  background-color: #f7a6a2;
  color: #fbf1e8;
  font-size: 30rpx;
  border: 0;
}

js代碼：

/**
   * 頁面的初始數據
   */
  data: {
    showModal: false,
    textV:''
  },

  /**
   * 控制顯示
   */
  eject:function(){
    this.setData({
      showModal:true
    })
  },

  /**
   * 點擊返回按鈕隱藏
   */
  back:function(){
    this.setData({
      showModal:false
    })
  },

  /**
   * 獲取input輸入值
   */
  wish_put:function(e){
    this.setData({
      textV:e.detail.value
    })
  },

  /**
   * 點擊確定按鈕獲取input值并且關閉彈窗
   */
  ok:function(){
    console.log(this.data.textV)
    this.setData({
      showModal:false
    })
  }

3.完整代碼

最后獻上完整代碼，有點啰嗦了，想盡量詳細點
wxml代碼：

<view class="body">
  <button bindtap='eject'>彈窗</button>
</view>
<view class="model" catchtouchmove='preventTouchMove' wx:if='{{showModal}}'></view>
<view class="modalDlg" catchtouchmove='preventTouchMove' wx:if='{{showModal}}'>
  <view class='windowRow'>
    <text class='userTitle'>標題
  </text>
    <view class='back' bindtap='back'>
      返回
    </view>
  </view>
  <view class='wishName'>
    <input bindinput='wish_put' placeholder='請輸入內容' class='wish_put'></input>
  </view>
  <view class='wishbnt'>
    <button class='wishbnt_bt' bindtap='ok'>確定</button>
  </view>
</view>

wxss代碼：

.body{
  width: 100%;
  height: 100%;
  background-color: #fff;
  position: fixed;
  display: flex;
}

.body button{
  height: 100rpx;
}

.model{
  position: absolute;
  width: 100%;
  height: 100%;
  background: #000;
  z-index: 999;
  opacity: 0.5;
  top: 0;
  left:0;
}

.modalDlg{
  width: 70%;
  position: fixed;
  top:350rpx;
  left: 0;
  right: 0;
  z-index: 9999;
  margin: 0 auto;
  background-color: #fff;
  border-radius: 10rpx;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.windowRow{
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  height: 110rpx;
  width: 100%;
}

.back{
  text-align: center;
  color: #f7a6a2;
  font-size: 30rpx;
  margin: 30rpx;
}

.userTitle{
  font-size: 30rpx;
  color: #666;
  margin: 30rpx;
}

.wishName{
  width: 100%;
  justify-content: center;
  flex-direction: row;
  display: flex;
  margin-bottom: 30rpx;
}

.wish_put{
  width: 80%;
  border: 1px solid;
  border-radius: 10rpx;
  padding-left: 10rpx;
}

.wishbnt{
  width: 100%;
  font-size: 30rpx;
  margin-bottom: 30rpx;
}


.wishbnt_bt{
  width: 50%;
  background-color: #f7a6a2;
  color: #fbf1e8;
  font-size: 30rpx;
  border: 0;
}

js代碼：

Page({

  /**
   * 頁面的初始數據
   */
  data: {
    showModal: false,
    textV:''
  },

  /**
   * 控制顯示
   */
  eject:function(){
    this.setData({
      showModal:true
    })
  },

  /**
   * 點擊返回按鈕隱藏
   */
  back:function(){
    this.setData({
      showModal:false
    })
  },

  /**
   * 獲取input輸入值
   */
  wish_put:function(e){
    this.setData({
      textV:e.detail.value
    })
  },

  /**
   * 點擊確定按鈕獲取input值并且關閉彈窗
   */
  ok:function(){
    console.log(this.data.textV)
    this.setData({
      showModal:false
    })
  }
})