前端笔记

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浏览器相关 ​

localStorage 与 sessionStorage ​

sessionStorage 属性允许你访问一个，对应当前源的 session Storage 对象。它与 localStorage 相似，不同之处在于 localStorage 里面存储的数据没有过期时间设置，而存储在 sessionStorage 里面的数据在页面会话结束时会被清除。

sessionStorage 在页面刷新时不会丢失。

深入：微任务与 Javascript 运行时环境 ​

CORS ​

模拟跨域 CORS

cors.html

html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>CORS</title>
  </head>
  <body>
    <script>
      fetch("https://openapi.baidu.com/oauth/2.0/token")
        .then((res) => res.json())
        .then((data) => {
          console.log(data);
        });
    </script>
  </body>
</html>
bash
Access to fetch at 'https://openapi.baidu.com/oauth/2.0/token' from origin 'http://127.0.0.1:8080' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

CORS 无状态码，Status 为 CORS error。