一面 2022/2/22 40min：凉                   自我介绍（说不讲项目）                              什么时候开始接触前端，怎么开始学前端，如何学                              红宝书影响比较深的点                                                  答了闭包和事件机制（下次要答事件循环）                                                            写个闭包           let num = 1;  setTimeout(() => {       console.log(num);  }, 100)                                         上面代码有哪些作用域：函数、全局                                                              上面的代码的闭包是哪些                                                                                  回答了定时器的函数和变量num，被说了num才是闭包（搞不懂）                                                                                                          看你项目前后端都写过，说一下前后端开发的区别                                                  后端偏业务，前端偏用户体验等（回答的不是特别好）                                                           讲一下小程序的登录注册实现的流程                                                  讲到了 token，token这一块好像没讲清楚，面试官不太理解                                                            前端把数据存在哪里：localStorage、vuex                              cookie 和 session 是啥，区别                              知道跨域嘛？                                                  讲了同源策略                                                              讲了项目访问图片跨域是怎么做的                                                            1，2，-1，-2 在计算机中以二进制储存是怎么样的                                                  原码、补码                                                            普通函数和箭头函数的区别                                                  疯狂讲，然后被打断了。。                                                            js 怎么知道当前是用什么浏览器？不懂                                                                            window.navigator.userAgent                                                              请求头有个 user-Agent 属性，应该是想考察到请求头的内容                                                            有没有做过动画                                                  transition                                                            transition 是css控制的嘛？不太明白问题                                                  答了是GPU，不懂（transform才是GPU，记混了。。。）                                                            手写：解析 URL 参数为对象                                                  只有 key 的话设置为 key: true                                                              相同 key 的话用数组保存                                                              中文要解码                                                              能用数字表示的话就转成数字                                         /**let url = 'https://www.aaa.com?hhhqzh=ppptyp&id=1&id=2&city=%a%a%s&enable';obj = { hhhqzh: ppptyp, id: [1, 2]; city: '广州', enable: true}*/function parseParam(url) {    const paramsStr = url.split('?')[1]; // 将 ？后面的字符串取出来    const paramsArr = paramsStr.split('&'); // 将字符串以 & 分割后存到数组    let paramsObj = {};    paramsArr.forEach((param) => {        // 处理有 value 的参数        if (param.indexOf('=') !== -1) {            let [key, val] = param.split('=');            val = decodeURIComponent(val); // 解码            val = /^d+$/.test(val) ? parseFloat(val) : val; // 判断是否转为数字            if (paramsObj.hasOwnProperty(key)) {                paramsObj[key] = [].concat(paramsObj[key], val);            } else {                paramsObj[key] = val;            }        } else {            // 处理没有 value 的参数            paramsObj[param] = true;        }    })    return paramsObj;}                     反问                                                  部门主要做啥，技术栈（react + ts）                                                              选择候选人的时候会不会对只会vue的面试者有权重的影响