console 命令行工具 X clear

console

var globalVariable1=0;
//打印localVariable1
//document.write(localVariable1);
//打印localVariable2
//document.write(globalVariable2);
function test1(){
    var localVariable1=2;
    //打印globalVariable1
    document.write(globalVariable1+"<br/>");
    //打印localVariable1
    document.write(localVariable1+"<br/>");
}
document.write("<br/>"+globalVariable2+"<br/>");
test1();

var globalVariable2=1;
function test2(){
    var localVariable2=3;
    //打印localVariable1
    //document.write(localVariable1);
}
test2();
document.write(globalVariable1+"<br/>");

document.write("=================================="+"<br/>");

function addSum(a, b){
    var sum = a + b;
    return sum;
}
var n = addSum(4,6) + 100;
document.write(n+"<br/>");

document.write("=================================="+"<br/>");
function RYear(year) {
    //判断闰年的条件
    if ((year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0)) {
        return year + "年是闰年~";
}
    else{
        return year + "年不是闰年~";
}
}
document.write(RYear(2000)+"<br/>");
document.write(RYear(2001)+"<br/>");
document.write(RYear(2020)+"<br/>");

document.write("=================================="+"<br/>");

function getMax(n1,n2,n3,n4) {
var maxNum;
maxNum = (n1 > n2) ? n1 : n2;
maxNum = (maxNum > n3) ? maxNum : n3;
maxNum = (maxNum > n4) ? maxNum : n4;
return maxNum;
}
document.write("5个数中的最大值为：" + getMax(57,36,89,78));

<!DOCTYPE html> 
<html>
<head>
    <meta charset="utf-8" />
    <title>直接调用</title>
    <script>
        //定义函数
        function gettest1()
        {
            document.write("早上好~"+"<br/>");
        }
        //调用函数
        gettest1();
        function GoodMes(){
            alert("嗯嗯嗯下午好");
        }
    </script>
</head>
<body>
    <a href="javascript:GoodMes()">下午好呀~</a>
</body>
</html>