码写

var n = parseInt(window.prompt('input'));


var mul = 1;
for (var i = 0; i < n; i++) {
mul *= 2;
}
document.write(mul);




var mul = 1;
for (var i = 1; i <= n; i++) {
mul *= i;
}

document.write(mul);

var n = parseInt(window.prompt('input'));


var first = 1, 
second = 1, 
third;
if (n > 2) {
for (var i=0; i< n-2; i++) {
third = first + second;
first = second;
second = third;
}

document.write(third);
} else {
document.write(1);
}

var count = 0;
for (var i=1; i < 100; i++) {
for (var j=1; j <=  Math.sqrt(i); j++) {
if (i % j == 0) {
count++;
}
}
if (count == 1) {
document.write(i + ',');
}
count = 0;
}

var num = (function(n){
if (n == 1) {
return 1;
}
return n*arguments.callee(n-1);
}(10))

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