SOURCE

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

writeDocument("最大值、最小值---------");
writeDocument("最大值："+Math.max(1,3,6,8,23,145));
writeDocument("最大值："+Math.min(1,3,6,8,23,145));

writeDocument("生成4为随机验证码---------");
function generateVerifyCode(length){
    var strletterNumber="0994764572849jjsfucvtgjrgbh~()";
    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("生成随机颜色值,rgb(,,)------------");
function getColor() {
        var r = Math.floor(Math.random() * 256);
        var g = Math.floor(Math.random() * 256);
        var b = Math.floor(Math.random() * 256);
        var rgb = "rgb(" + r + "," + g + "," + b + ")";
        return rgb;
        }
writeDocument(getColor());