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isPrime.html
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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
/*创建一个函数isPrime判断传入的参数是否为素数（质数），返回true 或 false。*/
function isPrime(n){
if (n <= 3) { return n > 1; }
if (n % 2 == 0 || n % 3 == 0) { return false; }
for (var i = 5; i * i <= n; i += 6) {
if (n % i == 0 || n % (i + 2) == 0) { return false; }
}
return true;
}
function isPrime1(n){
for (var j = 2; j <= Math.sqrt(n); j++) {
if (n % j == 0) {
return false;
} else {
return true;
}
}
}
var number = 20;
console.time('first');
console.log(isPrime(number));
console.timeEnd('first');
console.time('second');
console.log(isPrime1(number));
console.timeEnd('second');
</script>
</body>
</html>