Flash AS3教程：Random类

}

//在一个范围内获取一个随机值，返回结果范围：num1 >= num > num2
public static function range(num1:Number,num2:Number,isInt:Boolean = true):Number{
var num:Number = number(num2 - num1) num1;
if(isInt) num = Math.floor(num);
return num;
}

//在多个范围获取随机值
public static function ranges(...args):Number{
var isInt:Boolean = args[args.length - 1] is Boolean ? args.pop() : true;
var num:Number = randomRange(args);
if(!isInt) num = Math.random();
return num;
}

//获取一个随机字符，默认随机范围为数字 大小写字母，也可以指定范围，格式：a-z,A-H,5-9
public static function string(str:String = "0-9,A-Z,a-z"):String{
return String.fromCharCode(randomRange(explain(str)));
}

//生成指定位数的随机字符串
public static function bit(num:int,str:String = "0-9,A-Z,a-z"):String{
var reStr:String = "";
for(var i:int = 0; i < num; i ) reStr = string(str);
return reStr;
}

//获取一个随机的颜色值
public static function color(red:String = "0-255",green:String = "0-255",blue:String = "0-255"):uint{
return Number("0x" transform(randomRange(explain(red,false)))
transform(randomRange(explain(green,false)))
transform(randomRange(explain(blue,false))));
}

//将10进制的RGB色转换为2位的16进制
private static function transform(num:uint):String{
var reStr:String = num.toString(16);
if(reStr.length != 2) reStr = "0" reStr;
return reStr;
}

//字符串解析
private static function explain(str:String,isCodeAt:Boolean = true):Array{
var argAr:Array = new Array;
var tmpAr:Array = str.split(",");
for(var i:int = 0; i < tmpAr.length; i ){
var ar:Array = tmpAr[i].split("-");
if(ar.length == 2){
var arPush0:String = ar[0];
var arPush1:String = ar[1];
if(isCodeAt){
arPush0 = arPush0.charCodeAt().toString();
arPush1 = arPush1.charCodeAt().toString();
}
//此处如果不加1，将不会随机ar[1]所表示字符，因此需要加上1，随机范围才是对的
argAr.push(Number(arPush0),Number(arPush1) 1);