微信小程序开发之

获取用户微信绑定的手机号需要使用button的"open-type='getPhoneNumber'"，在获取之前需要检测（checkSession）是否登录。

    wxml：

<button open-type="getPhoneNumber" bindgetphonenumber="getPhoneNumber"></button>

    js：

data:{
    showLogin: false, //显示授权框
    session_key: null, 
    openid: null
},
// 检测是否登录
checkSession: function() {
    var that = this;
    wx.checkSession({
      success(res) {
        wx.getStorage({
          key: 'phone',
          success(res) {
            if (res.data) {
              that.setData({
                phoneNumber: res.data
              })
            } else {
              that.setData({
                showLogin: true
              })
            }
          }
        });
      },
      fail(res) {
        that.login();
        that.setData({
          showLogin: true
        })

      }
    })
},
// 登录
login: function() {
    var that = this;
    wx.login({
      success: res => {
        if (res.code) {
          wx.request({
            url: 'xxx',
            method: "GET",
            data: {
              code: res.code
            },
            header: {
              "content-type": "application/json"
            },
            success: function(res) {
              that.setData({
                openid: res.data.data.openid,
                session_key: res.data.data.session_key
              });
            },
            fail: function(res) {
              that.login()
            }
          })
        }
        // 发送 res.code 到后台换取 openId, sessionKey, unionId
      }
    });
},
// 获取手机号
getPhoneNumber: function(e) {
    var that = this,
      data = {
        encryptedData: e.detail.encryptedData,
        iv: e.detail.iv,
        openid: that.data.openid,
        session_key: that.data.session_key
      };
    if (e.detail.errMsg == 'getPhoneNumber:fail user deny') {
      wx.showToast({
        title: '授权失败，请重新授权',
        icon: 'none',
        duration: 2000
      })
    } else {
      wx.showLoading({
        title: '授权中',
        mask: true
      });
      that.setData({
        showLogin: false,
      });
      wx.request({
        method: "GET",
        url: 'xxx',
        data: data,
        header: {
          'content-type': 'application/json' // 默认值  
        },
        success: function(res) {
          if (res.data.status == 1001) {
            var phoneNum = res.data.data;
              that.setData({
                showLogin: false,
                phoneNumber: phoneNum
              });
              // 存储手机号
              wx.setStorage({
                key: 'phone',
                data: phoneNum
              })
          }
          // 隐藏授权框
          wx.hideLoading()
        },
        fail: function(res) {
          wx.showToast({
            title: '授权失败，请重新授权',
            icon: 'none',
            duration: 2000
          });
          that.setData({
            showLogin: true,
          });
          that.login();
        }
      });
    }
  },