首先是app.js:

App({
onLaunch: function () {
/*初始化APP自动登陆
* 您也可以在任何地方进行用户登陆验证
*用法:首先在js文件中定义 var app = getApp(); app.getUserDataToken();
*/
this.getUserDataToken();
},
getUserDataToken:function(){
var that = this;
//获取用户缓存token 此token是服务器作为用户唯一验证的标识,具体请看后端代码
var utoken=wx.getStorageSync("utoken");
wx.login({
success: function (res) {
var code=res.code;
wx.getUserInfo({
success: function (res) {
wx.request({
//用户登陆URL地址,请根据自已项目修改
url: 'https://66018954.qcloud.la/WxApp/index.php/UserApi/userAuthSlogin',
method:"POST",
data: {
utoken:utoken,
code: code,
encryptedData:res.encryptedData,
iv:res.iv
},
fail:function(res){

},
success: function(res) {
var utoken=res.data.utoken;
//设置用户缓存
wx.setStorageSync("utoken",utoken);
}
})
}
})
}
})
}
})

然后是php代码:

public function userAuthSlogin(){
$content = file_get_contents ( 'php://input' );
$content=json_decode($content,true);
$utoken=$content["utoken"];

if(!empty($utoken)&&S($utoken)){
$result["success"]=1;
$result['utoken']=$utoken;
echo json_encode($result);
exit();
}

$code=$content["code"];
$encryptedData=$content["encryptedData"];
$iv = $content['iv'];
/*获取session_key*/
$s_result=$this->getSession($code);
$WxData = new WXBizDataCrypt($s_result['appid'],$s_result['session_key']);
/*解密用户数据*/
$errCode = $WxData->decryptData($encryptedData, $iv, $user_data);
$wxap_key = md5(uniqid(md5(microtime(true)),true));
$result=array();
if($errCode==0){
$user_data=json_decode($user_data,true);
$result["success"]=1;
$result['utoken']=$wxap_key;
$user_id = $this->wxUserAdd($user_data);
if($user_id < 1 || empty($user_id)){
$result["success"]=-1;
$result['errCode']=0;
$result['msg']="获取用户信息出错!";
echo json_encode($result);
exit();
}
$user_data['uid']=$user_id;
S($wxap_key,$user_data,7200);
echo json_encode($result);
exit();
}else{
$result["success"]=-1;
$result['errCode']=$errCode;
$result['msg']="获取用户信息出错!";
echo json_encode($result);
exit();
}
}