SOURCE

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

writeDocument("最大值最小值:");
writeDocument("最大值"+ Math.max(1,5,657,8786,56,2));
writeDocument("最小值"+ Math.min(1,5,657,8786,56,2));

writeDocument("生成4/5/6位随机验证码:");

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

writeDocument("生成随机得到颜色 rgb:");
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;
}
document.write(getRandomColor());