SOURCE

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

writeDocument("=====================")
writeDocument("最大值："+Math.max(1,3,4,10,18));
writeDocument("最小值："+Math.min(1,3,4,10,18));

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

writeDocument("=====================")
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());