返回的是自纪元以来的毫秒数.你可以这样做:

What is returned is milliseconds since epoch. You could do:

var d = new Date();
d.setTime(1245398693390);
document.write(d);

关于如何完全按照您的需要设置日期格式，请参阅 http://www.w3schools.com/jsref/jsref_obj_date.asp

On how to format the date exactly as you want, see full Date reference at http://www.w3schools.com/jsref/jsref_obj_date.asp

您可以通过解析整数(如此处建议)来去除非数字:

You could strip the non-digits by either parsing the integer (as suggested here):

var date = new Date(parseInt(jsonDate.substr(6)));

或者应用以下正则表达式(来自评论中的 Tominator):

Or applying the following regular expression (from Tominator in the comments):

var jsonDate = jqueryCall();  // returns "/Date(1245398693390)/"; 
var re = /-?d+/; 
var m = re.exec(jsonDate); 
var d = new Date(parseInt(m[0]));