golang rand_js 代码
文件路径：/src/crypto/rand/rand_js.go
/ Copyright 2018 The Go Authors. All rights reserved.
/ Use of this source code is governed by a BSD-style
/ license that can be found in the LICENSE file.
/go:build js && wasm
package rand
import "syscall/js"
func init() {
Reader = &reader{}
}
var jsCrypto = js.Global().Get("crypto")
var uint8Array = js.Global().Get("Uint8Array")
/ reader implements a pseudorandom generator
/ using JavaScript crypto.getRandomValues method.
/ See https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues.
type reader struct{}
func (r *reader) Read(b []byte) (int, error) {
a := uint8Array.New(len(b))
jsCrypto.Call("getRandomValues", a)
js.CopyBytesToGo(b, a)
return len(b), nil
}