SOURCE

function writeDocument(variable)
{
    document.write(variable + "<br/>");
} 

writeDocument("生成随机验证码--------------");

function generateVerifyCode(length)
{
    var strValue="237886781837dfjsknsdffSDFHIEFHHNS";
    var code="";
    for(var i=0;i<length;++i)
    {
        var randomIndex =Math.floor(Math.random()*strValue.length);
        code += strValue.charAt(randomIndex);

    }
    return code;


}

writeDocument(generateVerifyCode(4));
writeDocument(generateVerifyCode(5));
writeDocument(generateVerifyCode(6));

writeDocument("用Math的方法找出3, 9, 15, 79, 45, 98中的最大值和最小值-------------");
writeDocument("最大值"+Math.max(3,9,15,79, 45, 98));
writeDocument("最小值"+Math.min(3,9,15,79, 45, 98));
//function shuzhi(a)
//{

 //   Math.max(a[i])

//}

writeDocument("请随机生成一个颜色值rgb(X, Y, Z)的函数,其中X，Y，Z表示的是0~255的数字---"); 
function getRandomColor()
{
    var r= Math.floor(Math.random()*(255+1));
    var g= Math.floor(Math.random()*(255+1));
    var b= Math.floor(Math.random()*(255+1));
    var rgb="rgb:("+ r + ","+g + ","+b + ","+")";
    return rgb;
}
writeDocument(getRandomColor());


//writeDocument("请写一个随机生成颜色值rgb(X, Y, Z)的函数,其中X，Y，Z表示的是0~255的数字---");