JS生成指定长度的随机数

 1 /**
 2  * 生成指定长度的UUID
 3  * @param len
 4  * @param radix
 5  * @returns uuid
 6  * eg: createUUID(8, 2) "01001010" createUUID(8, 10) "47473046" createUUID(8, 16) "098F4D35"
 7  */
调用
 var num = createUUID(6, 10);
 8 function createUUID(len, radix) {
 9     var chars = ‘0123456789‘.split(‘‘);
10     var uuid = [], i;
11     radix = radix || chars.length;
12     if(len){
13       for (i = 0; i < len; i++){
14           uuid[i] = chars[0 | Math.random()*radix];
15       } 
16     }
17     return ‘-‘+uuid.join(‘‘);
18 }