How to generate a UUID in js (code)

The content of this article is about how to generate a UUID (code) in js. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

function uuid(len, radix) {
    var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');
    var uuid = [], i;
    radix = radix || chars.length;
 
    if (len) {
      // Compact form
      for (i = 0; i < len; i++) uuid[i] = chars[0 | Math.random()*radix];
    } else {
      // rfc4122, version 4 form
      var r;
 
      // rfc4122 requires these characters
      uuid[8] = uuid[13] = uuid[18] = uuid[23] = &#39;-&#39;;
      uuid[14] = &#39;4&#39;;
 
      // Fill in random data.  At i==19 set the high bits of clock sequence as
      // per rfc4122, sec. 4.1.5
      for (i = 0; i < 36; i++) {
        if (!uuid[i]) {
          r = 0 | Math.random()*16;
          uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
        }
      }
    }
 
    return uuid.join(&#39;&#39;);
}

//Specify length and base

// 8 character ID (base=2)
uuid(8, 2) // "01001010"
// 8 character ID (base=10)
uuid(8, 10) // "47473046"
// 8 character ID (base=16)
uuid(8, 16) // "098F4D35"

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