WeChat 애플릿이 WeChat 인증 창을 호출합니다.

1. 无法弹出授权窗口2. 希望在用户已经授权的情况下，不显示按钮

wx.getSetting({
    success: res => {
        if (res.authSetting['scope.userInfo']) {
            console.log("app: " + "用户已经授权")
            // 已经授权，可以直接调用 getUserInfo 获取头像昵称，不会弹框
            wx.getUserInfo({
                success: res => {
                    // 可以将 res 发送给后台解码出 unionId
                    this.globalData.userInfo = res.userInfo
                    console.log(this.globalData.userInfo)
                    this.globalData.hasUserInfo = true
                    // 由于 getUserInfo 是网络请求，可能会在 Page.onLoad 之后才返回
                    // 所以此处加入 callback 以防止这种情况
                    if (this.userInfoReadyCallback) {
                        this.userInfoReadyCallback(res)
                    }
                },
                fail: (res) => {
                    console.log("app: " + "获取用户信息失败")
                }
            })
        }else {
            console.log("app: " + "用户暂时未授权")
        }
    }
})

<button open-type="getUserInfo" bindgetuserinfo="你自己定义函数"></button>

<block wx:if="{{!hasUserInfo}}">
    <image src=&#39;../../images/icon/wechat.png&#39;></image>
    <button open-type="getUserInfo" bindgetuserinfo="getUserInfo">微信授权登录</button>    
</block>

data: {
    userInfo: null,
    hasUserInfo: false
},
getUserInfo: function(e) {
    console.log("me: " + "用户点击授权")
    if(e.detail.userInfo){
        this.setData({
            userInfo: e.detail.userInfo,
            hasUserInfo: true
        })
        app.data.userInfo = this.userInfo
        app.data.hasUserInfo = true
    }
}

<block wx:if="{{!hasUserInfo}}">
    <image class="userAvatar" src=&#39;../../images/icon/wechat.png&#39;></image>
    <button open-type="getUserInfo" bindgetuserinfo="getUserInfo">微信授权登录</button>
</block>

onLoad: function() {    // 获取个人信息
    if(app.globalData.userInfo){        
            this.setData({
            userInfo: app.globalData.userInfo,
            hasUserInfo: true
        })
    }else{        
        // 在app.js没有获取到信息时，判断app.js的异步操作是否返回信息
        app.userInfoReadyCallback = res => {            
                this.setData({
                userInfo: app.globalData.userInfo,
                hasUserInfo: true
            })
        }
    }
}