javascript - Date.parse 的不同行为？

Question

alert(Date.parse('Mar 1 1990'));

在 jsFiddle 中，这将返回一个日期时间整数，如预期的那样。在我的机器上，它返回...时间戳字符串？

1990 年 3 月 1 日星期四 00:00:00 GMT-0500(EST) 与 636267600000

Answer 1

ECMAScript 语言规范

15.9.4.2 Date.parse (string)

The parse function applies the ToString operator to its argument and interprets the resulting String as a date and time; it returns a Number, the UTC time value corresponding to the date and time. The String may be interpreted as a local time, a UTC time, or a time in some other time zone, depending on the contents of the String. The function first attempts to parse the format of the String according to the rules called out in Date Time String Format (15.9.1.15). If the String does not conform to that format the function may fall back to any implementation-specific heuristics or implementation-specific date formats. Unrecognizable Strings or dates containing illegal element values in the format String shall cause Date.parse to return NaN.

您可能做错的是这两个测试不一样:

alert(Date.parse('Mar 1 1990')); 返回一个数字(始终)

alert(new Date('Mar 1 1990')); 返回您提到的字符串

(因为在日期对象上调用了 toString 方法)