SOURCE

function writeDocument(variable) 
{
document.write(variable + "<br/>");
} 
writeDocument("最大值&最小值---------------");
writeDocument("最大值：" + Math.max(234,324,423,543,775,354));
writeDocument("最小值：" + Math.min(234,324,423,543,775,354));

writeDocument("生成4位随机验证码-------------");

function generateVerifyCode(length)
{
    var strLetterNumber = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    var code = "";
    for (var i=0;i<length;++i)
    {
        var randomNumber = Math.floor(Math.random()*strLetterNumber.length);
        code = code + strLetterNumber.charAt(randomNumber);
    }
    return code;
}
writeDocument(generateVerifyCode(4));
writeDocument(generateVerifyCode(5));
writeDocument(generateVerifyCode(6));

writeDocument("生成随机的颜色 rgb(255,255,255)----------------");

function generateVerifyColor(length)
{
  var red = Math.floor(Math.random()*256);
  var green = Math.floor(Math.random()*256);
  var blue = Math.floor(Math.random()*256);

  writeDocument("rgb(" + red + "," + green + "," + blue + ")");
}
generateVerifyColor();