第一步：
在微信开放平台申请账号，获取AppID AppSecret
网址： https://open.weixin.qq.com/
第二步：通过appId就可以获取登录二维码，扫描登录获取code.
https://open.weixin.qq.com/connect/qrconnect?appid=wx5d7a3490f5c7e35e&redirect_uri=http:www.artdreamo2o.com&response_type=code&scope=snsapi_login&state=0
第三步：通过code获取access_token
https://api.weixin.qq.com/sns/oauth2/access_token?appid=wx5d7a3490f5c7e35e&secret=b79d315339b8562010522c8eec28c701&code=011m7z0y0bIX7h1Ype0y0FrJ0y0m7z0s&grant_type=authorization_code
如果成功返回的结果是：
{"access_token":"VasEW6fAgH0y2qYS-wHEG3pnbcN-C4AyOrB1szENTPKxszJACfgoHChKpceBMAbwq5Rv9CCUk74sXZXWJ8WiyopSnCfx_YWXVNFyKnP7riM","expires_in":7200,"refresh_token":"9LZEuPM105vDdoHXMxKRl6Ol9Tpm2e_-_zWw4Bd50jtINzsAstqWJOL2VSuLtu_KniSRuAG8XhnL4EaV0j6fdayK1ipOJj3tn205bEuKBC0","openid":"orJr8wWv6FfGxtD4Zo-iMsAj5ufY","scope":"snsapi_login","unionid":"oDunXwR51HtolHw6FLdfmp1jAw2s"}
第四步：通过access_token和openid获取用户的基础信息，包括头像、昵称、性别、地区
https://api.weixin.qq.com/sns/userinfo?access_token=VasEW6fAgH0y2qYS-wHEG3pnbcN-C4AyOrB1szENTPKxszJACfgoHChKpceBMAbwq5Rv9CCUk74sXZXWJ8WiyopSnCfx_YWXVNFyKnP7riM&openid=orJr8wWv6FfGxtD4Zo-iMsAj5ufY
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