SOURCE

function writeDocument(variable) {
    document.write(variable + "<br/>");
} 
//最大值最小值
writeDocument("最大值:"+Math.max(2,5,11,8,6,25,9));
writeDocument("最小值:"+Math.min(2,5,11,8,6,25,9));

//生成随机验证码
writeDocument("生成4位随机验证码--------------");
function generateVerifyCode(length){
    var strLetterNumber="012345678910ABCDEFGHIJKLMMOPQRSTUVWXYZ";
    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));
//生成随机颜色
writeDocument("生成随机颜色--------------");
function randomColour(){
    var r=Math.floor(Math.random()*256);
    var g=Math.floor(Math.random()*256);
    var b=Math.floor(Math.random()*256);
    rgb=r+","+g+","+b;
    return rgb;
}
writeDocument("RGB("+randomColour()+")");