创建摘要（例如 SHA-256）

// Convert string to ArrayBuffer. This step is only necessary if you wish to hash a string, not if you aready got an ArrayBuffer such as an Uint8Array.
var input = new TextEncoder('utf-8').encode('Hello world!');

// Calculate the SHA-256 digest
crypto.subtle.digest('SHA-256', input)
// Wait for completion
.then(function(digest) {
  // digest is an ArrayBuffer. There are multiple ways to proceed.

  // If you want to display the digest as a hexadecimal string, this will work:
  var view = new DataView(digest);
  var hexstr = '';
  for(var i = 0; i < view.byteLength; i++) {
    var b = view.getUint8(i);
    hexstr += '0123456789abcdef'[(b & 0xf0) >> 4];
    hexstr += '0123456789abcdef'[(b & 0x0f)];
  }
  console.log(hexstr);

  // Otherwise, you can simply create an Uint8Array from the buffer:
  var digestAsArray = new Uint8Array(digest);
  console.log(digestAsArray);
})
// Catch errors
.catch(function(err) {
  console.error(err);
});

目前的草案建议至少提供 SHA-1，SHA-256，SHA-384 和 SHA-512，但这不是严格要求，可能会有变化。但是，SHA 系列仍然可以被认为是一个不错的选择，因为它可能会在所有主流浏览器中得到支持。