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javascript/jquery 中的uniqid()？

发布于 2024-10-15 14:58:49 字数 239 浏览 3 评论 0原文

javascript中这个函数的等价物是什么：

http://php.net/manual/en/ function.uniqid.php

基本上我需要生成一个随机ID，如下所示：a4245f54345并以字母字符开头（这样我可以将其用作CSS id）

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风渺 2024-10-22 14:58:49

我一直在使用这个...

我使用它就像在 PHP 中使用它一样。两者返回相同的结果。

function uniqid(prefix = "", random = false) {
    const sec = Date.now() * 1000 + Math.random() * 1000;
    const id = sec.toString(16).replace(/\./g, "").padEnd(14, "0");
    return `${prefix}${id}${random ? `.${Math.trunc(Math.random() * 100000000)}`:""}`;
};

I have been using this...

I use it exactly as I would if it where PHP. Both return the same result.

function uniqid(prefix = "", random = false) {
    const sec = Date.now() * 1000 + Math.random() * 1000;
    const id = sec.toString(16).replace(/\./g, "").padEnd(14, "0");
    return `${prefix}${id}${random ? `.${Math.trunc(Math.random() * 100000000)}`:""}`;
};

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大姐，你呐 2024-10-22 14:58:49

试试这个（在 php 中工作）。

$prefix = chr(rand(97,121));  
$uniqid =  $prefix.uniqid(); // $uniqid = uniqid($prefix);

尝试一下 JavaScript::

var n = Math.floor(Math.random() * 11);
var k = Math.floor(Math.random() * 1000000);
var m = String.fromCharCode(n) + k;

Try this (Work in php).

$prefix = chr(rand(97,121));  
$uniqid =  $prefix.uniqid(); // $uniqid = uniqid($prefix);

Try this for JavaScript::

var n = Math.floor(Math.random() * 11);
var k = Math.floor(Math.random() * 1000000);
var m = String.fromCharCode(n) + k;

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尝蛊 2024-10-22 14:58:49

这里的所有答案（除了 phpjs）都不会生成唯一的 ID，因为它是基于随机的。随机并不唯一！

一个简单的解决方案：

window.unique_id_counter = 0 ;
var uniqid = function(){
    var id ;
    while(true){
        window.unique_id_counter++ ;
        id = 'uids_myproject_' + window.unique_id_counter ;
        if(!document.getElementById(id)){
            /*you can remove the loop and getElementById check if you 
              are sure that noone use your prefix and ids with this 
              prefix are only generated with this function.*/
            return id ;
        }
    }
}

如果需要，可以轻松添加动态前缀。只需将 unique_id_counter 更改为存储每个前缀的计数器的数组即可。

All answers here (except phpjs) don't generate unique IDs because it's based on random. Random is not unique !

a simple solution :

window.unique_id_counter = 0 ;
var uniqid = function(){
    var id ;
    while(true){
        window.unique_id_counter++ ;
        id = 'uids_myproject_' + window.unique_id_counter ;
        if(!document.getElementById(id)){
            /*you can remove the loop and getElementById check if you 
              are sure that noone use your prefix and ids with this 
              prefix are only generated with this function.*/
            return id ;
        }
    }
}

It's easy to add dynamic prefix if it's needed. Just change unique_id_counter into an array storing counters for each prefixes.

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不羁少年 2024-10-22 14:58:49

<html>
<head>
<script type="text/javascript">
function generateSerial(len) {
    var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
    var string_length = 10;
    var randomstring = '';

    for (var x=0;x<string_length;x++) {

        var letterOrNumber = Math.floor(Math.random() * 2);
        if (letterOrNumber == 0) {
            var newNum = Math.floor(Math.random() * 9);
            randomstring += newNum;
        } else {
            var rnum = Math.floor(Math.random() * chars.length);
            randomstring += chars.substring(rnum,rnum+1);
        }

    }
    alert(randomstring);
}
generateSerial(8);
</script>
</head>
<body>

</body>
</html>

虽然有点复杂，但我相信您已经明白要点了！
示例： http://jsfiddle.net/Ng4tB/

<html>
<head>
<script type="text/javascript">
function generateSerial(len) {
    var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
    var string_length = 10;
    var randomstring = '';

    for (var x=0;x<string_length;x++) {

        var letterOrNumber = Math.floor(Math.random() * 2);
        if (letterOrNumber == 0) {
            var newNum = Math.floor(Math.random() * 9);
            randomstring += newNum;
        } else {
            var rnum = Math.floor(Math.random() * chars.length);
            randomstring += chars.substring(rnum,rnum+1);
        }

    }
    alert(randomstring);
}
generateSerial(8);
</script>
</head>
<body>

</body>
</html>

It's a bit convoluted, but you get the gist I'm sure!
Example: http://jsfiddle.net/Ng4tB/

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愛上了 2024-10-22 14:58:49

真正的问题是，您是否需要 UUID 符合 RFC 4122？你的问题似乎表明你不这样做，所以简单地创建一个基于 Math.random() 的函数来生成这样的 ID 并不会太难。而且它会比 phpJS 实现快很多。

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背叛残局 2024-10-22 14:58:49

function uniqId(prefix) {
    if (window.performance) {
        var s = performance.timing.navigationStart;
        var n = performance.now();
        var base = Math.floor((s + Math.floor(n))/1000);
    } else {
        var n = new Date().getTime();
        var base = Math.floor(n/1000);
    }   
    var ext = Math.floor(n%1000*1000);
    var now = ("00000000"+base.toString(16)).slice(-8)+("000000"+ext.toString(16)).slice(-5);
    if (now <= window.my_las_uid) {
        now = (parseInt(window.my_las_uid?window.my_las_uid:now, 16)+1).toString(16);
    }
    window.my_las_uid = now;
    return (prefix?prefix:'')+now;
}

它是按照与 PHP 的 uniqId() “相同”原理生成的 - 特别以微秒为单位的编码时间。

function uniqId(prefix) {
    if (window.performance) {
        var s = performance.timing.navigationStart;
        var n = performance.now();
        var base = Math.floor((s + Math.floor(n))/1000);
    } else {
        var n = new Date().getTime();
        var base = Math.floor(n/1000);
    }   
    var ext = Math.floor(n%1000*1000);
    var now = ("00000000"+base.toString(16)).slice(-8)+("000000"+ext.toString(16)).slice(-5);
    if (now <= window.my_las_uid) {
        now = (parseInt(window.my_las_uid?window.my_las_uid:now, 16)+1).toString(16);
    }
    window.my_las_uid = now;
    return (prefix?prefix:'')+now;
}

it is generated on "the same" priciple as PHP's uniqId() - specifically encoded time in microseconds.

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隐诗 2024-10-22 14:58:49

Underscore.js 有一个 uniqueid() 方法
https://underscorejs.org/#uniqueId

_.uniqueId([前缀])
为需要的客户端模型或 DOM 元素生成一个全局唯一的 id。如果传递了前缀，则 id 将附加到其上。
_.uniqueId('contact_');  
=> '联系_104'

Underscore.js has a uniqueid() method
https://underscorejs.org/#uniqueId

_.uniqueId([prefix])
Generate a globally-unique id for client-side models or DOM elements that need one. If prefix is passed, the id will be appended to it.
_.uniqueId('contact_');  
=> 'contact_104'

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埋情葬爱 2024-10-22 14:58:49

找到这个：

https://github.com/makeable /uuid-v4.js/blob/master/uuid-v4.js

并对此稍加修改：

function uniqid(length){
  var dec2hex = [];
  for (var i=0; i<=15; i++) {
    dec2hex[i] = i.toString(16);
  }

  var uuid = '';
  for (var i=1; i<=36; i++) {
    if (i===9 || i===14 || i===19 || i===24) {
      uuid += '-';
    } else if (i===15) {
      uuid += 4;
    } else if (i===20) {
      uuid += dec2hex[(Math.random()*4|0 + 8)];
    } else {
      uuid += dec2hex[(Math.random()*16|0)];
    }
  }

  if(length) uuid = uuid.substring(0,length);
  return uuid;
}

效果很好。

Found this:

https://github.com/makeable/uuid-v4.js/blob/master/uuid-v4.js

and slightly modified to this:

function uniqid(length){
  var dec2hex = [];
  for (var i=0; i<=15; i++) {
    dec2hex[i] = i.toString(16);
  }

  var uuid = '';
  for (var i=1; i<=36; i++) {
    if (i===9 || i===14 || i===19 || i===24) {
      uuid += '-';
    } else if (i===15) {
      uuid += 4;
    } else if (i===20) {
      uuid += dec2hex[(Math.random()*4|0 + 8)];
    } else {
      uuid += dec2hex[(Math.random()*16|0)];
    }
  }

  if(length) uuid = uuid.substring(0,length);
  return uuid;
}

works great.

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