Get the current timestamp in milliseconds since the Unix epoch.
获取自 Unix 纪元以来的当前时间戳（毫秒）。
The current timestamp in milliseconds. 当前时间戳（毫秒）
const ts = timestamp() // => 1700000000000 (example) Copy
const ts = timestamp() // => 1700000000000 (example)
Measuring elapsed time:
const start = timestamp()// ... some operationconst elapsed = timestamp() - start Copy
const start = timestamp()// ... some operationconst elapsed = timestamp() - start
Get the current timestamp in milliseconds since the Unix epoch.
获取自 Unix 纪元以来的当前时间戳（毫秒）。