开发者工具版本：v1.02.1904090自己定制的input标签在开发者工具预览的时候会自动跳到下一个标签内，有时候又会来回跳。真机模拟不会。wxml代码：

<view class=‘row’ style=’ background-image:url({{login_bg}});’>

  <view class=‘login’>

    <form bindsubmit=‘loginIn’>

      <view class=‘b20’>

        <input type=‘text’ name=“username” placeholder=‘请输入账号’ value=’’></input>

      </view>

      <view class=‘b20’>

        <input type=‘password’ name=“password” placeholder=‘请输入密码’ value=’’></input>

      </view>

      <button form-type=‘submit’>登陆</button>

      </form>

  </view>

</view>

wxss代码：

/* pages/login.wxss */

.login{

  width: 70%;

  height:400rpx;

  margin: 0 auto;

  margin-top: 400rpx;

}

.login button{

  float: left;

  width: 100%;

}

.b20{

  margin-bottom: 30rpx;

  width: 100%;

  float: left;

  height: 100rpx;

}

.b20 input{

  padding: 5px;

  background-color: #f9f9f9;

  border-radius: 10rpx;

  height: 80rpx;

  text-align: center;

}

js代码：

// pages/login.js

var app = new getApp();

Page({

  /**

   * 页面的初始数据

   */

  data: {

    login_bg: app.url.stc +"/images/login_bg.png"

  },

  loginIn:function(e){

    console.log(e);

    var username = e.detail.value.username;

    var password = e.detail.value.password;

   console.log(username + password);

    if(username == ‘’){

      wx.showLoading({

        title: ‘账号为空’,

      });

      setTimeout(function () {

        wx.hideLoading()

      }, 2000)

      return;

    }

    if (password == ‘’) {

      wx.showLoading({

        title: ‘密码为空’,

      });

      setTimeout(function () {

        wx.hideLoading()

      }, 2000)

      return;

    }

    //var data = “username=”+username+"&password="+password;

    wx.request({

      url: app.url.stc+’/admin/login.do’,

      data:{

        username:username,

        password:password

      },

      header: {

        “Content-Type”: “application/x-www-form-urlencoded”

      },

      method: “POST”,

      success(res) {

        console.log(res);

        if (res.statusCode == 200){

          if (res.data.result == 0){

            var cookies = res.header[‘Set-Cookie’];

            cookies = cookies.split(";")[0];

            if (wx.getStorageSync(“cookieKey”) == ‘’){

              wx.setStorageSync(‘cookieKey’, cookies);

              app.header.cookie= cookies;

            }

            wx.showLoading({

              title: ‘登陆成功’,

            });

            setTimeout(function () {

              wx.hideLoading()

              wx.reLaunch({

                url: ‘…/home/home’

              })

            }, 2000)

 

          }else{

            wx.showModal({

              title: ‘提示’,

              content: ‘用户名或者密码错误’,

              showCancel: false

            })

          }

        }else{

          wx.showModal({

            title: ‘提示’,

            content: ‘用户名或者密码错误’,

            showCancel: false

          })

        }

      },

      fail: function () {

        wx.showToast({

          title: ‘登陆失败’,

          icon: ‘success’,

          duration: 2000

        })

      }

    });

  },

  /**

   * 生命周期函数–监听页面加载

   */

  onLoad: function (options) {

    if (wx.getStorageSync(“cookieKey”) != ‘’){

      console.log(“有cookie值”);

      wx.reLaunch({

        url: ‘…/home/home’

      })

   }

  },

  /**

   * 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 () {

  }

})

代码片段：https://developers.weixin.qq.com/s/2CSa2Rme7X7U