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dome.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
//计算2的n次幂,n可输入,n为自然数;
<script type = "text/javascript">
var n = parseInt(window.prompt('input'));
1*2
1*2*2
1*2*2*2
1*2*2*2*2
var mul = 1;
for(var i = 0;i < n;i ++){
mul *= 2;
}
document.write(mul);
</script>
</body>
</html>