SOURCE

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

writeDocument("生成随机验证码---------");

function generateVerify(length){
    var strValue="456789GSDFGHJKL";
    var code="";
    for(var i=0;i<length;++i){
        var randomIndex=Math.floor(Math.random()*strValue.length);
        code+=strValue.charAt(randomIndex);
    }
    return code;
}
writeDocument(generateVerify(4));

writeDocument("找出3，9，12，99，45，78中的最大值和最小值-------");
var a = Math.max(3, 9, 12, 99, 45, 78);
var b = Math.min(3, 9, 12, 99, 45, 78);
document.write("最大值为：" + a + "最小值为：" + b);

writeDocument("请随机生成一个颜色值rgb(X,Y,Z),其中xyz表示的是0~255的数字-------");
function getColor() {
            var x = Math.floor(Math.random() * (255+1));
            var y = Math.floor(Math.random() * (255+1));
            var z = Math.floor(Math.random() * (255+1));
            var rgb = "rgb(" + x + "," + y + "," + z + ")";
            return rgb;
        }
document.write(getColor());