console 命令行工具 X clear

console

var globalVariable1=0;


function test1(){
    document.write(localVariable1+"<br/>");
    var localVariable1=2;
    //打印globalVariable1
    document.write(globalVariable1+"<br/>");

    //打印localVariable2
    document.write(localVariable1+"<br/>");
}

//打印localVariable1
//document.write(localVariable1);

//打印globalVariable2
document.write(globalVariable2);


test1();

var globalVariable2=1;

function test2(){
    var localVariable2=3;

    //打印localVariable1
    //document.write(localVariable1+"<br/>");
}
test2();

//打印localVariable2
//document.write(localVariable2+"<br/>");
//打印globalVariable1
document.write(globalVariable1+"<br/>");

function welcomeMes(){
    alert("Welcome");
}

function add(left,right){
    return left+right;
}

document.write((add(1,2)+3)+'<br/>');

//判断是否是闰年
function isLeapYear(year){
    var result=false;
    //判断是否是闰年

    if((year%4==0)&&(year%100!=0)){
        result=true;
    }

    if(year%400==0){
        result=true;
    }

    if(result){
        document.write(year+"is a leap year.<br/>");
    }else{
        document.write(year+"is not a leap year.<br/>");
    }
}

//打印2020，2000，2001是否是闰年
isLeapYear(2020);
isLeapYear(2000);
isLeapYear(2001);


//求四个数中的最大数

function isMax(a){
    var b=0;
    for(var i=0;i<4;i++){
        for(var j=0;j<4;j++){
            if(a[j]>a[i+1]){
                b=a[j];
                a[j]=a[j+1];
                a[j+1]=b;
            }
        }
    }
    document.write(a[4]+"是最大数<br/>");
}
//打印最大数
var a=[4,24,8,3];
isMax(a);

<!DOCTYPE html> 
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <script>
    </script>
</head>
<body>
    <div>
        <a href="javascript:welcomeMes()">Welcome</a>
    </div>
</body>
</html>