1、先登录微信开放平台，没有账号就申请一个，地址：https://open.weixin.qq.com/
2、点击管理工具-》创建网站应用
3、填写基本信息及网站信息
4、等待审核成功后还要绑定公众号到认证的公众号上。
5、我们来看代码怎么写，我们以php为例
<?php以上代码运行后，pc网站会直接跳到微信的二维码扫码页面，类似于这样
class wxlogin
{
var $appid = "sx23213123123123";
var $appsecret = "123124324esfdsfdsf23434324234";
//构造函数，获取Access Token
public function __construct($appid = NULL, $appsecret = NULL) {
//扫码登录不需要该Access Token, 语义理解需要
//1. 本地写入,防止token过期
$res = @file_get_contents('access_token.json');
$result = json_decode($res, true);
$this->expires_time = $result["expires_time"];
$this->access_token = $result["access_token"];
if (time() > ($this->expires_time + 3600)) {
$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" . $this->appid . "&secret=" . $this->appsecret;
$res = $this->http_request($url);
$result = json_decode($res, true);
$this->access_token = $result["access_token"];
$this->expires_time = time();
file_put_contents('test/access_token.json', '{"access_token": "' . $this->access_token . '", "expires_time": ' . $this->expires_time . '}');
}
}
//生成扫码登录的URL,
public function qrconnect($redirect_url, $scope, $state = NULL) {
$url = "https://open.weixin.qq.com/connect/qrconnect?appid=" . $this->appid . "&redirect_uri=" . urlencode($redirect_url) . "&response_type=code&scope=" . $scope . "&state=" . $state . "#wechat_redirect";
return $url;
}
//生成OAuth2的Access Token
public function oauth2_access_token($code) {
$url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" . $this->appid . "&secret=" . $this->appsecret . "&code=" . $code . "&grant_type=authorization_code";
$res = $this->http_request($url);
return json_decode($res, true);
}
//获取用户基本信息（OAuth2 授权的 Access Token 获取 未关注用户，Access Token为临时获取）
public function oauth2_get_user_info($access_token, $openid) {
$url = "https://api.weixin.qq.com/sns/userinfo?access_token=" . $access_token . "&openid=" . $openid . "&lang=zh_CN";
$res = $this->http_request($url);
return json_decode($res, true);
}
public function http_request($url) {
return file_get_contents($url);
}
}
$weixin = new wxlogin();
if (!isset($_GET["code"])) {
$redirect_url = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
$jumpurl = $weixin->qrconnect($redirect_url, "snsapi_login", "123");
Header("Location:$jumpurl");
} else {
//获取token
$oauth2_info = $weixin->oauth2_access_token($_GET["code"]);
//获取用户信息
$userinfo = $weixin->oauth2_get_user_info($oauth2_info['access_token'], $oauth2_info['openid']);
//参数样式$userinfo用户信息结构
//array(10) { ["openid"]=> string(28) "oJDSV0lWOjfXE7VXk6C4_QuiUtQY" ["nickname"]=> string(6) "俊哥" ["sex"]=> int(1) ["language"]=> string(5) "zh_CN" ["city"]=> string(6) "成都" ["province"]=> string(6) "四川" ["country"]=> string(6) "中国" ["headimgurl"]=> string(129) "http://thirdwx.qlogo.cn/mmopen/vi_32/JuV6pCO123H8xHXGe7goSW9tFy0PKLL1zSH3uVuJ9QZ9omZeZ8TjfWGdtjtOBLAs82VqriajFecBys0pGjicVBow/132" ["privilege"]=> array(0) { } ["unionid"]=> string(28) "oAnnw0ix6eEYev5w7AUR29VoS-ow" }
//登录成功后跳转
// header("Location:************");
}
如果用户想自己生成二维码让用户扫码，可以选择下面这种js的方式。
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
</head>
<body>
<span id="login_container"></span>
<script src="http://res.wx.qq.com/connect/zh_CN/htmledition/js/wxLogin.js"></script>
<script>
var obj = new WxLogin({
id: "login_container",
appid: "werewxdxdsfsdfsfsdfsfdsfd",
scope: "snsapi_login",
redirect_uri: encodeURIComponent("http://" + window.location.host + "/login.php"), //这个是获取code后的回调地址
state: Math.ceil(Math.random()*1000),
style: "black",
href: ""});
</script>
</body>
</html>
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