近期在工作和项目中用到的一些小方法整理一下，将会陆续贴出来，希望给你有点帮助！
    随机关键字方法比较适合用于生成随机密码，和数据库关键字(在Ajax和Flash客户端生成)!

//随机关键字生成方法(AS和JS里都可以使用)
function getRandomKeyID(len){
    if (len == undefined) {
        len = 6;
    }
    var keyID = "";
    var char_arr = new Array();
    char_arr.push(function () {
        return String.fromCharCode(48+Math.floor(Math.random()*10));
    });
    char_arr.push(function () {
        return String.fromCharCode(97+Math.floor(Math.random()*26));
    });
    char_arr.push(function () {
        return String.fromCharCode(65+Math.floor(Math.random()*26));
    });
    for (var i = 0; i<len; i++) {
        keyID += char_arr[Math.floor(Math.random()*char_arr.length)]();
    }
    return keyID;
}


//获取在两个数值之间(包含两个数值)的随机数方法(AS和JS里都可以使用)
function getRandomNumber(minNum,maxNum){
    if(minNum == undefined){
        minNum = 0;
        maxNum = 10;
    }else if(maxNum == undefined){
        maxNum = minNum;
        minNum = 0;
    }else if(maxNum < minNum){
        var tmpNum = maxNum;
        maxNum = minNum;
        minNum = tmpNum;
    }
    return Math.floor(Math.random()*(maxNum-minNum+1))+minNum;
}


//全字符串替换(AS和JS里都可以使用)
function replaceAll(str,oldStr,reStr){
    return str.split(oldStr).join(reStr);
}