小程序登录时如何获取input框中的内容

　　最近写小程序项目遇到一些问题，今天整理下这些问题的解决方法，希望对用户有帮助。下面是登录页，点击登录时获取input框中的值，

效果如下：
　　

100

101

102

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104

105

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107

108

wxml布局如下：
 
<view >
      <input type="text" placeholder-style="color:#fff;" bindinput="userNameInp" placeholder="请输入账号" />
</view>
<view >
      <input  password placeholder-style="color:#fff;" bindinput="usePasswordInp" placeholder="请输入密码"/>
</view>
 <button class="loginBtn" bindtap='loginFn'>登录</button>
 
js代码如下：
const app = getApp();
Page({
 
  /**
   * 页面的初始数据
   */
  data: {
    userName: "",
    passWord: "",
  },
  //监听输入的账号
  userNameInp: function (e) {
    this.data.userName = e.detail.value;
  },
  //监听输入的密码
  usePasswordInp: function (e) {
    this.data.passWord = e.detail.value;
  },
  //登录
  loginFn: function () {
    var that = this;
    if (that.data.userName.length == 0 || that.data.passWord.length == 0) {
      wx.showToast({
        title: '账号或密码为空',
        icon: 'loading',
        duration: 2000
 
      })
    } else {
      wx.showLoading({
        title: '登录中...',
      })
      wx.request({
        url: 'https://localhost:8180/exam/login',
        data: {
          username: that.data.userName,
          password: that.data.passWord
        },
        header: {
          'content-type': 'application/x-www-form-urlencoded' // 默认值
        },
        method: 'post',
        success: function (res) {
          wx.hideLoading();
          wx.removeStorageSync('sessionid');
          // console.log('登录成功', res.data.data);
          if (res.data.code == "0000") {
            wx.showToast({
              title: '登录成功',
              icon: 'success',
              duration: 1000
            })
            wx.setStorageSync('sessionid', res.header['Set-Cookie']); //保存Cookie到Storage
            wx.setStorage({
              key: 'myData',
              data: res.data.data
            })
            wx.redirectTo({
              url: '/pages/index/index',
            })
          } else {
            wx.showToast({
              title: '登录失败',
              icon: 'none',
              duration: 2000
            })
          }
        },
        fail: function (e) {
          wx.showToast({
            title: '服务器出现错误',
            icon: 'none',
            duration: 2000
          })
        }
 
      })
    }
 
  },
 
  //跳转到忘记密码页面
  onTapDayWeather() {
    wx.navigateTo({
      url: '/pages/updatepwd/updatepwd',
    })
  },
 
  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
 
  },
 
 
})