<view class='selection'> <view class='{{view1}}' bindtap='view1Click' id='1'>a</view> <view class='{{view2}}' bindtap='view2Click' id='2'>b</view> <view class='{{view3}}' bindtap='view3Click' id='3'>c</view> <view class='{{view4}}' bindtap='view4Click' id='4'>d</view></view>

Page({   /**   * 頁面的初始數據   */  data: {   view1: 'selection1',   view2: 'selection1',   view3: 'selection1',   view4: 'selection1',   // 默認答案為2，后臺會給的   key: 2,   // 選項是否被點擊   isSelect: false  },   view1Click: function(e) {   var select = e.target.id   // 選項沒被選擇時將執行   if (!this.data.isSelect) {    // 將選項設置為“已被選擇”    this.setData({     isSelect: true    })    // 注意！此處必須是'=='而不是'='    if (select == this.data.key) {     this.setData({      view1: 'selection2'     })    } else {     this.setData({      view1: 'selection3'     })     // 將正確選項顯示出來     this.showAnswer(this.data.key)    }    }  },  view2Click: function(e) {   var select = e.target.id   // 選項沒被選擇時將執行   if (!this.data.isSelect) {    this.setData({     isSelect: true    })    // 注意！此處必須是'=='而不是'='    if (select == this.data.key) {     this.setData({      view2: 'selection2'     })    } else {     this.setData({      view2: 'selection3'     })     // 將正確選項顯示出來     this.showAnswer(this.data.key)    }    }  },  view3Click: function(e) {   var select = e.target.id   // 選項沒被選擇時將執行   if (!this.data.isSelect) {    this.setData({     isSelect: true    })    // 注意！此處必須是'=='而不是'='    if (select == this.data.key) {     this.setData({      view3: 'selection2'     })    } else {     this.setData({      view3: 'selection3'     })     // 將正確選項顯示出來     this.showAnswer(this.data.key)    }    }  },  view4Click: function(e) {   var select = e.target.id   // 選項沒被選擇時將執行   if (!this.data.isSelect) {    this.setData({     isSelect: true    })    // 注意！此處必須是'=='而不是'='    if (select == this.data.key) {     this.setData({      view4: 'selection2'     })    } else {     this.setData({      view4: 'selection3'     })     // 將正確選項顯示出來     this.showAnswer(this.data.key)    }    }  },  showAnswer: function(key) {   // 通過swith語句判斷正確答案，從而顯示正確選項   switch (key) {    case 1:     this.setData({      view1: 'selection2'     })     break;    case 2:     this.setData({      view2: 'selection2'     })     break;    case 3:     this.setData({      view3: 'selection2'     })     break;    default:     this.setData({      view4: 'selection2'     })   }  } })

.selection1{width: 400rpx;height: 150rpx;background-color: grey;display: flex;flex-direction: column;justify-content: space-around;align-items: center;}.selection2{width: 400rpx;height: 150rpx;background-color: blue;display: flex;flex-direction: column;justify-content: space-around;align-items: center;}.selection3{width: 400rpx;height: 150rpx;background-color: red;display: flex;flex-direction: column;justify-content: space-around;align-items: center;}.selection{width: 750rpx;height: 800rpx;display: flex;flex-direction: column;justify-content: space-around;align-items: center;}