/* *@desc:生成随机字符串 *@remark:toString方法可以接收一个基数作为参数的原理，这个基数从2到36封顶。如果不指定，默认基数是10进制 */ function generateRandomAlphaNum(len) {     var rdmString = "";     for (; rdmString.length < len; rdmString += Math.random().toString(36).substr(2));     return rdmString.substr(0, len); }

//JS生成GUID函数,类似.net中的NewID(); function S4() {     return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1); } function NewGuid() {     return (S4() + S4() + "-" + S4() + "-" + S4() + "-" + S4() + "-" + S4() + S4() + S4()); }

//JS生成GUID函数,类似.net中的NewID(); function newGuid() {     var guid = "";     for (var i = 1; i <= 32; i++) {         var n = Math.floor(Math.random() * 16.0).toString(16);         guid += n;         if ((i == 8) || (i == 12) || (i == 16) || (i == 20))             guid += "-";     }     return guid; }

/* *@desc:生成随机字符串 *@demo:console.log(ranStr()); */ ;(function(){     //数字0-9，大写字母，小写字母，ASCII或UNICODE编码（十进制），共62个     var charCodeIndex = [[48,57],[65,90],[97,122]];     var charCodeArr = [];     function getBetweenRound(min,max){         return Math.floor(min+Math.random()*(max-min));     };     function getCharCode(){         for(var i=0,len=3;i<len;i++){             var thisArr = charCodeIndex[i];             for(var j=thisArr[0],thisLen=thisArr[1];j<=thisLen;j++){                 charCodeArr.push(j);             }         }     }     function ranStr(slen){         slen = slen || 20;         charCodeArr.length<62 && getCharCode();         var res = [];         for(var i=0;i<slen;i++){             var index = getBetweenRound(0,61);             res.push(String.fromCharCode(charCodeArr[index]));         }         return res.join('');     };     this.ranStr = ranStr; })();