<view class='yanzhengma'>  <text class='left'>{[code]}</text>  <text class='right' bindtap='huanyizhang'>換一張</text></view>

.yanzhengma {  height: 100rpx;  display: flex;  align-items: center;  justify-content: center;} .yanzhengma .left {  font-family: Arial;  font-style: italic;  font-weight: bold;  border: 0;  letter-spacing: 3px;  font-size: 18px;  background-color: #ccc;  padding: 10rpx;  margin-right: 20rpx;  color: blue;}

Page({   data: {   },   /**   * 生命周期函數--監聽頁面加載   */  onLoad: function(options) {  //剛進入頁面隨機先獲取一個    this.createCode()   },  huanyizhang(){    this.createCode()  },  createCode() {    var code;    //首先默認code為空字符串    code = '';    //設置長度，這里看需求，我這里設置了4    var codeLength = 4;    //設置隨機字符    var random = new Array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z');    //循環codeLength 我設置的4就是循環4次    for (var i = 0; i < codeLength; i++) {      //設置隨機數范圍,這設置為0 ~ 36      var index = Math.floor(Math.random() * 36);      //字符串拼接 將每次隨機的字符 進行拼接      code += random[index];    }    //將拼接好的字符串賦值給展示的code    this.setData({      code: code    })  }, })