console 命令行工具 X clear

console

document.write('<br/>');
var globalVariable1 = 0;

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

//打印golbalVariable2
document.write(globalVariable2);

 function test1(){
     var localVariable1 = 2;
     //打印golbalVariable1
     document.write(globalVariable1 + "<br/>")

     //打印localVariable1
     document.write(localVariable1 + "<br/>");
 }
test1();
var globalVariable2 = 1;

  function test2(){
     var localVariable2 = 3;

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

//打印loalVariable2
// document.write(localVariable2 + "<br/>")
//打印loalVariable1
 document.write(globalVariable1 + "<br/>");

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

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

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

 function isLeapYear(year) {
    //普通年能被4整除且不能不100整除的 世纪年是能被400整除
    //判断是不是闰年
    if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0))  {
        return year + "是闰年";
            }
    else{
        return year + "不是闰年";
            }
        }
document.write(isLeapYear(2020));
document.write('<br/>');
document.write(isLeapYear(2000));
document.write('<br/>');
document.write(isLeapYear(2001));

document.write('<br/>');

/*function getMax(a,b,c,d) {
    var maxNum;
    maxNum = (a > b) ? a : b;
    maxNum = (maxNum > c) ? maxNum : c;
    maxNum = (maxNum > d) ? maxNum : d;
    return maxNum;
    }
document.write("4个数中的最大值为：" + getMax( 9, 1, 12, 50));*/

function getMax(a,b,c,d,e) {
    var maxNum;
    maxNum = (a > b) ? a : b;
    maxNum = (maxNum > c) ? maxNum : c;
    maxNum = (maxNum > d) ? maxNum : d;
    maxNum = (maxNum > e) ? maxNum : e;
    return maxNum;
        }
document.write("5个数中的最大值为：" + getMax(165, 26, 34, 47, 5));

document.write('<br/>');
function getMin(a,b,c,d,e) {
    var minNum;
    minNum = (a > b) ? b : a;
    minNum = (minNum > c) ? c : minNum;
    minNum = (minNum > d) ? d : minNum;
    minNum = (minNum > e) ? e : minNum;
    return minNum;
        }
document.write("5个数中的最小值为：" + getMin(5, 675, 7, 334, 9));

<!DOCTYPE html> 
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <script>
        function welcomeMes()
        {
            alert("Welcome");
        }
    </script>
</head>
<body>
    <a href="javascript:welcomeMes()">欢迎</a>
</body>
</html>