js能获取openid吗

// 用户点击登录按钮后，跳转到微信授权页面
function redirectToWeixinAuth() {
    var appId = 'your_weixin_app_id';
    var redirectUri = encodeURIComponent(window.location.href);
    window.location.href = `https://open.weixin.qq.com/connect/oauth2/authorize?appid=${appId}&redirect_uri=${redirectUri}&response_type=code&scope=snsapi_base&state=STATE#wechat_redirect`;
}

// 微信授权后重定向回来，获取 code 并请求 OpenID
window.onload = function() {
    var urlParams = new URLSearchParams(window.location.search);
    var code = urlParams.get('code');
    if (code) {
        fetchOpenID(code);
    }
};

function fetchOpenID(code) {
    var appId = 'your_weixin_app_id';
    var secret = 'your_weixin_app_secret';
    fetch(`/api/weixin/openid?code=${code}&appid=${appId}&secret=${secret}`)
        .then(response => response.json())
        .then(data => {
            console.log('OpenID:', data.openid);
        })
        .catch(error => {
            console.error('Error fetching OpenID:', error);
        });
}