SOURCE

var arr=[1,2,3,4,5,6,7,8];
document.write("数组为："+arr+'</br>');
document.write("--------------获取数组的长度--------------"+'</br>');
document.write("数组的长度为："+arr.length+'</br>');
document.write("--------------获取数组的1-2号元素--------------"+'</br>');
document.write(arr.slice(0,2)+'</br>');
document.write("--------------往数组头添加元素--------------"+'</br>');
arr.unshift(0);
document.write("数组为："+arr+'</br>');
document.write("--------------往数组尾部添加元素--------------"+'</br>');
arr.push(9);
document.write("数组为："+arr+'</br>');
document.write("--------------删除数组的第一个元素--------------"+'</br>');
arr.shift()
document.write("数组为："+arr+'</br>');
document.write("--------------删除数组的最后一个元素--------------"+'</br>');
arr.pop()
document.write("数组为："+arr+'</br>');
document.write("--------------对数组中的元素进行升序的排列--------------"+'</br>');
document.write(arr.sort()+'</br>');//均会转换为字符串

var numarr=[3,5,2,6,9,4];//升序排列函数
function upcompare(left,right)
{
    if(left-right>0)
    {
        return 1;
    }
    if(left-right==0)
    {
        return 0;
    }
    if(left-right<0)
    {
        return -1;
    }
}

//document.write(numarr.sort(upcompare)+'</br>');  

document.write("--------------反转数字数组--------------"+'</br>');
document.write("原数组为："+numarr+'</br>');
document.write("反转后，数组为："+numarr.reverse()+'</br>');
document.write(numarr.join(":")+'</br>');
document.write("--------------给字符添加尖括号--------------"+'</br>');
function addanglebracket(strvalue)
{
    var temp=strvalue.split("").join("><");
    var temp1=temp.split("");
    temp1.unshift("<");
    temp1.push(">");
    return temp1.join("");
}
var strvalue="绿叶学习网";
document.write(strvalue+'</br>');
document.write(addanglebracket(strvalue)+'</br>'); 




document.write("--------------javascript时间对象--------------"+'</br>');
document.write("--------------javascript时间对象--------------"+'</br>');
function write(variable)
{
    document.write(variable+"</br>");
}

write("---------------定义时间对象-------------------");
var oToday =new Date();

write("-------------------获取年，月，日，时，分，秒，毫秒-----------------");
write("年："+oToday.getFullYear());
write("月："+oToday.getMonth());
write("日："+oToday.getDate());
write("时："+oToday.getHours());
write("分："+oToday.getMinutes());
write("秒："+oToday.getSeconds());
write("毫秒："+oToday.getMilliseconds());

write("-------------------获取年，月，日，时，分，秒，毫秒-----------------");
var oDate= new Date(2019);
oDate.setFullYear(2020);
write("年："+oDate.getFullYear());
oDate.setMonth(5);
write("月："+(oDate.getMonth()+1));
oDate.setDate(1);
write("日："+oDate.getDate());
oDate.setHours(16);
write("时："+oDate.getHours());
oDate.setMinutes(58);
write("分："+oDate.getMinutes());
oDate.setSeconds(59);
write("秒："+oDate.getSeconds());
oDate.setMilliseconds(999);
write("毫秒："+oDate.getMilliseconds());

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

write("----------打印2019年6月1日 星期六 15:59:59:999-------------"); 
var oPrintDate = new Date(2019, 5, 1, 15, 59, 59, 999); 
write(oPrintDate.getFullYear()+"年"+(oPrintDate.getMonth()+1)+"月"+oPrintDate.getDate()+"日"+week[oPrintDate.getDay()]+oPrintDate.getHours()+"："+oPrintDate.getMinutes()+"："+oPrintDate.getSeconds()+"："+oPrintDate.getMilliseconds());



document.write("--------------javascript数学对象--------------"+'</br>');
document.write("--------------javascript数学对象--------------"+'</br>');

write("----------生成一个随机数-------------"); 
function generateVerifyCode(length)
{
    var strvalue="0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    var code="";

    for (var i=0;i<length;i++)
    {
        var randomIndex =Math.floor(Math.random()*strvalue.length);
        code +=strvalue.charAt(randomIndex);
    }
    return code;
}

write(generateVerifyCode(4));
write(generateVerifyCode(8));

write("--------------用Math的方法找出3，9，12，99，45，78中的最大值和最小值-------------")

write("其中的最大值为："+Math.max(3,9,12,99,45,78));
write("其中的最小值为："+Math.min(3,9,12,99,45,78));




write("--------------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 randomcolor ()
{
    var r;
    var g;
    var b;
    var color=[r, g, b];
    for(var i=0;i<3;i++)
    {
        color[i]=Math.floor(Math.random()*(255+1));
    }
    return color;
}
write(randomcolor ());

<!DOCTYPE html> 
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <script>
        
    </script>
</head>
<body>
</body>
</html>