🎯 从整数列表中抽取Pick an Integer
从整数列表中随机抽取一个或多个（可设种子复现，可要求不重复）。适合抽签和抽样，本地处理。Pick one or more integers at random from a list (optional seed for reproducibility; optional unique picks). Handy for draws and sampling. Processed locally.
使用说明与常见问题How-to & FAQ
「从整数列表中抽取」是什么？What is the Pick an Integer tool?
从整数列表中随机抽取一个或多个（可设种子复现，可要求不重复）。适合抽签和抽样，本地处理。Pick one or more integers at random from a list (optional seed for reproducibility; optional unique picks). Handy for draws and sampling. Processed locally.
如何使用「从整数列表中抽取」？How do I use the Pick an Integer tool?
在「从整数列表中抽取」中，把内容粘贴或输入到上方输入框，按需设置「抽取个数」、「种子（留空 = 真随机）」、「分隔」，结果会实时显示在下方，点击「复制结果」即可复制。Paste the list of integers to draw from, set "How many" to pick and tick "Unique" if a value may only be picked once. Leave "Seed" blank for a truly random draw, or enter a value to repeat the same draw; choose the "Separator" and click "Copy result" to copy the picks.
怎样输入多个整数？How do I enter several integers?
每行一个，或用空格、逗号、分号分隔。像 1,234,567 这样每 3 位一个逗号的写法按千位分隔读作一个数（所以 10,100 是 10100，要表示两个数请写 10 100）；也可以用下划线分组（1_000）。负号可用 -、−（U+2212）或全角 －，全角数字也能识别。小数、科学计数法（1e3）或夹杂文字会报错并指出是第几个、完整显示那个值。One per line, or separated by spaces, commas or semicolons. A value with a comma every three digits, like 1,234,567, is read as one number with thousands separators (so 10,100 is 10100; write 10 100 for two values); underscores also group digits (1_000). Minus can be a hyphen, the Unicode minus (U+2212) or the fullwidth minus, and fullwidth digits work. Decimals, scientific notation (1e3) or stray text give an error naming the position and showing the whole value.
结果精确吗？Are the results exact?
精确。所有整数都按大整数（BigInt）逐位处理，不经过浮点，超过 2^53 的数（例如 9007199254740993）也不会被舍入。粘贴几千上万行也是线性处理，通常在几十毫秒内完成。Yes. Every value is handled as a big integer (BigInt) with no floating-point step, so numbers above 2^53 such as 9007199254740993 are never rounded. Pasting thousands of lines is processed in linear time, usually within tens of milliseconds.
种子有什么用？What is the seed for?
相同列表、个数和种子会得到相同抽取结果；留空则每次不同。The same list, count and seed always pick the same way; leave blank for a fresh draw.
「不重复」是什么意思？What does Unique mean?
每个位置最多被抽中一次。如果列表里本身有重复的值（例如 1 1 2），结果里仍可能出现两个 1；需要按值不重复，请先用「排序整数列表」勾选去重。Each position in the list is picked at most once. If the list itself repeats a value (1 1 2), the result can still contain two 1s; to make values unique, first use Sort Integers with Remove duplicates.
输入和输出是什么样的？What does the input and output look like?
例如在「从整数列表中抽取」中输入 1 ⏎ 2 ⏎ 3，「抽取个数」设为 1，「种子（留空 = 真随机）」设为 1，输出为：2（⏎ 表示换行）。For example, the Pick an Integer turns the input 1 ⏎ 2 ⏎ 3, "How many" set to 1, "Seed (blank = truly random)" set to 1 into: 2 (⏎ marks a line break).
有哪些选项可以调整？What options can I adjust?
「从整数列表中抽取」的设置：「抽取个数」默认 1；「种子（留空 = 真随机）」可留空；「分隔」可选 每行一个、空格、逗号、分号（默认 每行一个）；可勾选：「不重复」、「千位逗号」。改动任一选项后结果会按新设置重新生成。Settings in the Pick an Integer — "How many" default 1; "Seed (blank = truly random)" optional; "Separator": One per line, Spaces, Commas, Semicolons (default One per line); tick boxes: "Unique", "Thousands commas". Changing any option regenerates the result with the new setting.
「从整数列表中抽取」免费吗？需要注册吗？Is the Pick an Integer free? Do I need an account?
「从整数列表中抽取」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Pick an Integer is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.