微信小程序实现随机验证码功能

  {[code]}
  换一张

.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: {
 
  },
 
  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function(options) {
  //刚进入页面随机先获取一个
    this.createCode()
 
  },
  huanyizhang(){
    this.createCode()
  },
  createCode() {
    var code;
    //首先默认code为空字符串
    code = '';
    //设置长度，这里看需求，我这里设置了4
    var codeLength = 4;
    //设置随机字符
    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');
    //循环codeLength 我设置的4就是循环4次
    for (var i = 0; i