SOURCE

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

writeDocument("定义时间对象-------------"); 
var oToday = new Date();
writeDocument("获取年，月，日，时，分，秒，毫秒-------------");
 writeDocument("年:"+oToday.getFullYear());
  writeDocument("月:"+oToday.getMonth());
   writeDocument("日:"+oToday.getDate());
    writeDocument("时:"+oToday.getHours());
    writeDocument("分:"+oToday.getMinutes()); 
    writeDocument("秒:"+oToday.getSeconds());
writeDocument("毫秒: "+oToday.getMilliseconds());

writeDocument("设置年，月，日，时，分，秒，毫秒-------------");
var oDate = new Date(2019);

oDate.setFullYear(2020);
writeDocument("年:  "+oDate.getFullYear());
oDate.setMonth(5);
writeDocument("月:  "+(oDate.getMonth()+1));
oDate.setDate(1);
writeDocument("日:  "+oDate.getDate()); 
oDate.setHours(16);
writeDocument("时:  "+oDate.getHours());
oDate.setMinutes(58);
writeDocument("分:  "+oDate.getMinutes()); 
oDate.setSeconds(59);
writeDocument("秒:  "+oDate.getSeconds()); 
oDate.setMilliseconds(999);
writeDocument("毫秒:  "+oDate.getMilliseconds());

var weeks = ["星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"]; 

writeDocument("今天是"+weeks[oToday.getDay()]);
var oPrintDate = new Date(2019,5,1,15,59,59,999);
writeDocument("打印2019年6月1日 星期六 15:59:59:999-------------------");



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

writeDocument("生成随机验证码----------");

function generateVerifyCode(length){
    var strValue ="1234567890QWTKDSCNHJFJFXVNM";
    var code ="";
    for(var i = 0;i<length;++i)
    {
        var randomIndex = Math.floor(Math.random()*strValue.length)
        code += strValue.charAt(randomIndex);
    }
    return code;
}

writeDocument(generateVerifyCode(4));
writeDocument(generateVerifyCode(5));
writeDocument(generateVerifyCode(6));


writeDocument("用Math的方法找出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);

writeDocument("3, 9, 12, 99, 45, 78最大值为"+ a);
writeDocument("3, 9, 12, 99, 45, 78最小值为"+ b);


writeDocument("请随机生成一个颜色值rgb(X, Y, Z)的函数,其中X，Y，Z表示的是0~255的数字---"); 

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());