js for循环 1-100的和 /1-100奇数和/1-100偶数和
**1-100的和 **<html><head></head><body></body><script>var sum=0;for(var i=1;i<=100;i++){sum+=i;}alert(sum);</s
·
**1-100的和 **
<html>
<head></head>
<body>
</body>
<script>
var sum=0;
for(var i=1;i<=100;i++){
sum+=i;
}
alert(sum);
</script>
</html>

1-100奇数和
<html>
<head>
</head>
<body>
</body>
<script>
var sum=0;
for(var i=1;i<=100;i+=2){
sum+=i;
}
alert(sum);
</script>
</html>

1-100偶数和
<html>
<head>
</head>
<body>
</body>
<script>
var sum=0;
for(var i=2;i<=100;i+=2){
sum+=i;
}
alert(sum);
</script>
</html>

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