html：

<!--pages/forgotpwd/forgotpwd.wxml--><view class="container">  <form bindsubmit='submit_email' wx:if="{{form_index == 0}}">      <label>找回密码：第1步</label>      <view class="section">          <input name="no" type='number' placeholder-class='small'  placeholder='请输入学号' />      </view>      <view class="section">          <input name="email" placeholder-class='small' placeholder='请输入绑定的邮箱' />      </view>      <button type='primary' placeholder-class='small' formType="submit" >下一步</button>  </form>  <form bindsubmit='submit_password' wx:else>    <label>找回密码：第2步</label>    <view class="section">      <view class="left">         <input name="pwd" password="{{mask}}" placeholder-class='small' placeholder='输入新密码' />      </view>      <view class="right">          <switch   bindchange="switchChange"/>      </view>    </view>    <view class="section">      <view class="left">         <input name="validcode" type='number'  placeholder-class='small' placeholder='输入邮件中的验证码'/>      </view>      <view class="right">          <text style="color:#aaa">剩余：{{second}}秒</text>      </view>    </view>    <button type='primary' formType="submit" disabled="{{disabled}}" >提交</button>  </form></view>

js：

// pages/forgotpwd/forgotpwd.jsconst app = getApp();function countdown(that) {  var second = that.data.second  if (second == 0) {    that.setData({      disabled: true    });    return;  }  var time = setTimeout(function () {    that.setData({      second: second - 1    });    countdown(that);  }    , 1000)}Page({  /**   * 页面的初始数据   */  data: {    form_index: 0,    no: null,    second: 30,    disabled: false,    mask: true  },  switchChange: function (e) {    // console.log(e.detail.value)    this.setData({ mask: !e.detail.value })  },  //提交邮箱  submit_email: function (e) {    var no = e.detail.value.no;    var email = e.detail.value.email;    if (email == null || email == '') {      wx.showToast({        title: '请输入邮箱',        icon: 'none',        duration: 2000      })      return;    }    wx.showLoading({      title: '网络请求中...',    })    wx.request({      url: 'https://www.lishuming.top/pj/index.php/student/api/forgotpwd',（接口）      data: {        no: no,        email: email      },      method: "POST",      header: {        'content-type': 'application/x-www-form-urlencoded'      },      success: (res) => {        wx.hideLoading();        // console.log(res.data);        if (res.data.error) {          wx.showToast({            title: res.data.msg,            icon: 'none',            duration: 2000          })        } else {          this.setData({ no: no, second: res.data.expire });          countdown(this);          wx.showToast({            title: res.data.msg,            icon: 'none',            duration: 2000          })          setTimeout(() => {            this.setData({ form_index: 1 });          }, 2000)        }      }    })  },  //重设密码  submit_password: function (e) {    console.log(e);    var validcode = e.detail.value.validcode;    var pwd = e.detail.value.pwd;    if (validcode == '' || validcode == null || pwd == '' || pwd == null) {      wx.showToast({        title: '验证码和密码不能为空',        icon: 'none',        duration: 2000      })    } else {      wx.request({        url: 'https://www.lishuming.top/pj/index.php/student/api/initpassword',        method: 'POST',        data: {          no: this.data.no,          validcode: validcode,          pwd: pwd        },        header: {          'content-type': 'application/x-www-form-urlencoded'        },        success: (res) => {          // console.log(res.data);          if (res.data.error) {            wx.showToast({              title: res.data.msg,              icon: 'none',              duration: 2000            })          } else {            wx.showToast({              title: res.data.msg,              icon: 'success',              duration: 2000            })            setTimeout(() => {              wx.navigateBack({                delta: 1              })            }, 2000)          }        }      })    }  },  /**   * 生命周期函数--监听页面加载   */  onLoad: function (options) {  },  /**   * 生命周期函数--监听页面初次渲染完成   */  onReady: function () {  },  /**   * 生命周期函数--监听页面显示   */  onShow: function () {  },  /**   * 生命周期函数--监听页面隐藏   */  onHide: function () {  },  /**   * 生命周期函数--监听页面卸载   */  onUnload: function () {  },  /**   * 页面相关事件处理函数--监听用户下拉动作   */  onPullDownRefresh: function () {  },  /**   * 页面上拉触底事件的处理函数   */  onReachBottom: function () {  },  /**   * 用户点击右上角分享   */  onShareAppMessage: function () {  }})