/**@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;})();