url：

http://localhost:81/login?redirect=%2Findex&access_token=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJvdUV4dGVybmFsSWQiOiI0OTI2MjYzMTIxMDU1NDAxMTM4IiwiYXVkIjpbImVudGVycHJpc2VfbW9iaWxlX3Jlc291cmNlIiwiYmZmX2FwaV9yZXN

截取参数： 

 let url = window.location.href ;             //获取当前urllet  dz_url = url.split('#')[0];                //获取#/之前的字符串let  cs = dz_url.split('?')[1];                //获取?之后的参数字符串let  cs_arr = cs.split('&');                    //参数字符串分割为数组let params = {};
// 遍历数组，将键值对保存到params对象中cs_arr.forEach(pair => {let keyValue = pair.split('=');params[keyValue[0]] = keyValue[1];});
// 提取access_token的值let accessToken = params['access_token'];