The following code is used for using a presigned POST form to bucket. When adding the object preSignedUrl-put.txt to examplebucket, generate the corresponding POST form signature data.

<!DOCTYPE html>​
<html lang="en">​
  <head>​
    <meta charset="UTF-8" />​
    <title>Document</title>​
  </head>​
  <body>​
    <script src="https://tos-public.volccdn.com/obj/volc-tos-public/@volcengine/tos-sdk@latest/browser/tos.umd.production.min.js"></script>​
    <script src="https://cdnjs.cloudflare.com/ajax/libs/axios/1.4.0/axios.min.js"></script>​
    <script type="text/javascript">​
      const client = new TOS({​
        region: yourRegion,​
        endpoint: yourEndpoint,​
        accessKeyId: yourAccessKey,​
        accessKeySecret: yourSecretKey,​
        stsToken: yourSecurityToken,​
        bucket: examplebucket,​
      });​
      const objectName = 'exampledir/preSignedUrl-put.txt';​
​
      const main = async () => {​
        const result = await client.preSignedPostSignature({​
          bucket: examplebucket,​
          key: objectName,​
        });​
        console.log('preSignedPostSignature:', result);​
      };​
​
      main();​
    </script>​
  </body>​
</html>​