JS實現的生成隨機數的4個函數分享_基礎知識

function NewGuid() {
    return (S4() S4() "-" S4() "-" S4() "-" S4() "-" S4() S4() S4());
}

    function getBetweenRound(min,max){
        return Math.floor(min Math.random()*(max-min));
    };

    function getCharCode(){
        for(var i=0,len=3;i             var thisArr = charCodeIndex[i];
            for(var j=thisArr[0],thisLen=thisArr[1];j                 charCodeArr.push(j);
            }
        }
    }

    function ranStr(slen){
        slen = slen || 20;
        charCodeArr.length

        var res = [];
        for(var i=0;i             var index = getBetweenRound(0,61);
            res.push(String.fromCharCode(charCodeArr[index]));
        }
        return res.join('');
    };

    this.ranStr = ranStr;
})();