JavaScript 生成32位UUID

 1            function uuid(){
 2                 var len=32;      //32长度
 3                 var radix=16;    //16进制
 4                 var chars='0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');
 5                 var uuid=[],i;
 6                 radix=radix || chars.length;
 7                 if(len){
 8                     for(i=0;i<len;i++){
 9                         uuid[i]=chars[0 | Math.random()*radix];
10                     }
11                 }else{
12                     var r;
13                     uuid[8]=uuid[13]=uuid[18]=uuid[23]='-';
14                     uuid[14]='4';
15                     for(i=0;i<36;i++){
16                         if(!uuid[i]){
17                             r=0 | Math.random()*16;
18                             uuid[i]=chars[(i==19)?(r&0x3)|0x8:r];
19                         }
20                     }
21                 }
22                return uuid.join('');
23             }