几句 javascript 转 C# 谢谢各位了

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这是 gist 连接看起来要好看些

https://gist.github.com/pyengwoei/f34848cc5bf1911e19e6b7773a740c41

如果不能打开就只有看没有格式化的了
var alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_".split(""),
length = 64,
map = {},
seed = 0,
i = 0,
prev;

function encode(num) {
var encoded = "";
do {
encoded = alphabet[num % length] + encoded;
num = Math.floor(num / length)
} while (num > 0);
return encoded
}

function yeast() {
var now = encode(+new Date);
if (now !== prev) return seed = 0, prev = now;
return now + "." + encode(seed++)
}
aaa =yeast();

num

encoded

encode

13 replies • 2016-10-14 23:30:34 +08:00

lrh3321

Oct 14, 2016

直接在 C#里执行它算了。

https://github.com/sebastienros/jint

对 js 不熟，不确定 +new Date 返回的到底是什么

pyengwoei

Oct 14, 2016

@lrh3321 +new Date 返回的是时间戳类似这样 1476425715

sutra

Oct 14, 2016

不带这样伸手的吧。

pyengwoei

Oct 14, 2016

@sutra 我自己也在转，边百度边转，但是可能对于 C#熟悉的人几分钟就好了，望见谅

lrh3321

Oct 14, 2016

我尽力了

var aaa =ClassA.yeast();

```csharp
static class ClassA
{
static char[] alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_".ToCharArray();
static int length = 64, seed = 0, i = 0;

static string prev = null;

public static string encode(long num) {
var encoded = "";
do {
encoded = alphabet[num % length] + encoded;
num = (int)(num / length) ;
} while (num > 0);
return encoded;
}

/// <summary>
/// 获取时间戳
/// </summary>
/// <returns></returns>
public static long GetTimeStamp()
{
TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
return (long)ts.TotalMilliseconds;
}

public static string yeast() {
var now = encode(GetTimeStamp());
if (now != prev){
seed = 0;
return prev = now;

}
return now + "." + encode(seed++);
}
}

```

sutra

Oct 14, 2016

var aaa = Convert.ToBase64String(DateTime.Now.Ticks / TimeSpan.TicksPerMillisecond);

imcxy

Oct 14, 2016

@sutra 看起来好吊，我决定去学 C#了~

sutra

Oct 14, 2016

@imcxy 我可能看错了， JS 原文好像不是 base64.

lrh3321

Oct 14, 2016

num = (int)(num / length) ;
改成
num = (long)(num / length) ;

用长整型应该更保险一点

pyengwoei

Oct 14, 2016

@lrh3321 好的我再试试，我刚刚试了正确得出的是一个五位数的字符 LV1JPJk 但是用 C#得出的是 1V1_ZP2 开头还对不太起来好像就是 encoded = alphabet[num % length] + encoded; 这里有点问题，不过其他地方应该都没什么问题了，这里我再试试

pyengwoei

Oct 14, 2016

@lrh3321 现在好像可以了这次得到的结果是 LV20I3B

pyengwoei

Oct 14, 2016

@lrh3321 感谢了

SoloCompany

Oct 14, 2016

base64 和 64 进制有区别吗？不就是 base64 换了两个特殊字符吗