let unix_timestamp = 1549312452

// Create a new JavaScript Date object based on the timestamp

// multiplied by 1000 so that the argument is in milliseconds, not seconds.

var date = new Date(unix_timestamp * 1000);

// Hours part from the timestamp

var hours = date.getHours();

// Minutes part from the timestamp

var minutes = "0" + date.getMinutes();

// Seconds part from the timestamp

var seconds = "0" + date.getSeconds();



// Will display time in 10:30:23 format

var formattedTime = hours + ':' + minutes.substr(-2) + ':' + seconds.substr(-2);



console.log(formattedTime);

有关Date对象的更多信息，请参考MDN或ECMAScript5规范。