console 命令行工具 X clear

console

//利用3种循环来计算1+2+3+…+100的值。
document.write("利用3种循环来计算1+2+3+…+100的值:<br/>");
//1 .for循环
document.write("for循环:");
var sum1 = 0;
for (var i = 0; i <= 100; i++) {
sum1 = sum1 + i;
}
document.write(sum1);
document.write("<br />");



//2. while循环
document.write("while循环:");
var sum2 = 0;
var i = 0;
while (i <= 99) {
i++;
sum2 += i;
}
document.write(sum2);
document.write("<br />");



// do-while语句
document.write("do-while循环:");
var sum3 = 0;
var i = 0;
do {
i++;
sum3 += i;
}
while (i <= 99);

document.write(sum3);

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

    </script>
</body>
</html>