console 命令行工具 X clear

console

function writeDocument(variable)
{
    document.write(variable + "<br/>");
} 
   
function fn(num1,num2)
{
    let sum = num1+num2 ;
    if(num2+1>100)
    {
        return sum;
    }else
    {
        return fn(sum,num2+1)
    }
}
let sum = fn(1,2)
console.log(sum);
writeDocument(sum);


//for循环
var sy=0;
for(b=1;b<=100;b++)
{
    sy+=b;
}
   document.write(sy+"<br/>");

//while
var sy=0;b=1;
while(b<=100)
{
    sy+=b;
    b++;
}
document.write(sy+"<br/>");

//do while
var sy=1;
var sum1=0;
do{
    sum1+=sy;
    sy++;
}while(sy<=100);
document.write(sum1);

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