Javascript 如何在javascript中将String转换为long？
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How to convert a String to long in javascript?
提问by Richard H
I have a millisecond timestamp that I need to convert from a String to long. Javascript has a parseIntbut not a parseLong. So how can I do this?
我有一个毫秒时间戳，我需要将它从字符串转换为 long。Javascript 有一个parseInt但没有parseLong. 那么我该怎么做呢？
Thanks
谢谢
Edit: To expand on my question slightly: given that apparently javascript doesn't have a long type, how can I do simple arithmetic with longs that are initially expressed as strings? E.g subtract one from the other to get a time delta?
编辑：稍微扩展一下我的问题：鉴于javascript显然没有long类型，我如何对最初表示为字符串的long进行简单的算术运算？例如，从另一个中减去一个以获得时间增量？
回答by Russ Cam
JavaScript has a Numbertype which is a 64 bit floating point number*.
JavaScript 的Number类型是 64 位浮点数*。
If you're looking to convert a string to a number, use
如果您想将字符串转换为数字，请使用
- either
parseIntorparseFloat. If usingparseInt, I'd recommend always passing the radix too. - use the Unary
+operator e.g.+"123456" - use the
Numberconstructor e.g.var n = Number("12343")
- 无论是
parseInt或parseFloat。如果使用parseInt，我建议也总是传递基数。 - 使用一元
+运算符，例如+"123456" - 使用
Number构造函数，例如var n = Number("12343")
*there are situations where the number will internally be held as an integer.
*在某些情况下，数字将在内部保留为整数。
回答by Jakub Konecki
It's because there is no longin javascript.
这是因为longjavascript 中没有。
