微信小程序获取手机信息（微信小程序获取手机号的踩坑记录）

      <view class="cu-form-group">
            <view class="title text-black">联系电话</view>
            <input class="radius"  name="mobile"   placeholder="请输入联系电话" value="{{detail.mobile}}" bindinput="onInputMobile"></input>
            <button bindgetphonenumber="getPhoneNumber" class="cu-btn line-blue sm" openType="getPhoneNumber">获取电话</button>
        </view>

    onLoad: async function () {
        this.getSessionKey()
    },
    async getSessionKey() {
        const { code } = await wx.login()
        const res = await Index.getSessionKey({
            code
        })
        if (res.code == 1) {
            this.setData({
                session_key: res.data
            })
        }
    },
    getPhoneNumber: async function (e) {
        if (e.detail.errMsg === "getPhoneNumber:ok") {
            const res = await Index.getPhone({
                iv: e.detail.iv,
                encryptedData: e.detail.encryptedData,
                session_key: this.data.session_key
            })
            if (res.err == 0) {
                wx.showToast({
                    title: '网络有点儿小波动，请点击重试',
                    icon: 'none'
                })
                return
            }
            const detail = this.data.detail
            detail.mobile = res.err.phoneNumber
            this.setData({
                detail
            })
        } else if (e.detail.errMsg === "getPhoneNumber:fail user deny") {
            wx.showModal({
                title: '提示',
                content: '你已拒绝授权，请重新点击并授权',
                showCancel: false,
                confirmText: "知道了"
            })
        }
    },