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uniqid() in javascript/jquery?

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孤城傲影
孤城傲影 2021-01-02 09:58

what\'s the equivalent of this function in javascript:

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

Basically I need to generate a random ID that looks like:

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8条回答
  • 孤街浪徒
    2021-01-02 10:33

    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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  • 南旧
    2021-01-02 10:38

    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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  • 野的像风
    2021-01-02 10:38

    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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  • 天命终不由人
    2021-01-02 10:40 
    <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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  • 北荒
    2021-01-02 10:48

    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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  • 攒了一身酷
    2021-01-02 10:48

    The real question is, do you need the UUID to be RFC 4122 compliant? Your question seems to suggest you don't, so it wouldn't be too hard to create a function based simply on Math.random() to generate IDs like that. Plus it will be a lot faster than the phpJS implementation.

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