uniapp微信公众号H5获取code进行登录

export const getUrlCode = function() {
    let code = getUrlParam('code'); // 截取路径中的code，如果没有就去微信授权，如果已经获取到了就直接传code给后台获取openId
    const local = window.location.href;
    let redirect_url = encodeURIComponent(local) //回调的地址要编码
    if (code == null || code === '') {
        window.location.href =
            `https://open.weixin.qq.com/connect/oauth2/authorize?appid=wx23ab834e27fd68ea&redirect_uri=${redirect_url}&response_type=code&scope=snsapi_userinfo&state=1#wechat_redirect`
    }
}
//判断路径中有没有返回code
const getUrlParam = function(name) {
    var reg = new RegExp('(^|&)' + name + '=([^&]*)(&|$)');
    var r = window.location.search.substr(1).match(reg);
    if (r != null) return unescape(r[2]);
    return null
}

const pages = getCurrentPages();
const currentPage = pages[pages.length - 1]; //当前页面的全部信息
const route = currentPage.route; //当前路由的路径 pages/login/login
const options = currentPage.options; //url里面的参数json类型

let url = this.getnewurl('code')
window.history.replaceState(null, null, url);
//此方法是把code给删掉并把拼接好的URL返回
getnewurl(name) {
                var loca = window.location;
                var baseUrl = loca.origin + loca.pathname;
                var query = loca.search.substr(1);
                const pages = getCurrentPages();
                const currentPage = pages[pages.length - 1];
                const route = currentPage.route; //当前路由的路径 pages/login/login
                const options = currentPage.options; //url里面的参数json类型
                if (query.indexOf(name) > -1) {
                    var obj = {}
                    var arr = query.split("&");
                    for (var i = 0; i < arr.length; i++) {
                        arr[i] = arr[i].split("=");
                        obj[arr[i][0]] = arr[i][1];
                    };
                    delete obj[name];
                    var url = baseUrl + '#/' + route + '?' + JSON.stringify(options).replace(/[\"\{\}]/g, "").replace(
                        /\:/g, "=").replace(/\,/g, "&");
                    return url
                };
            },