​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript Math.sqrt()</h1>
​
<p>Math.sqrt(x) 返回 x 的平方根：</p>
​
<p id="demo"></p>
​
<script>
document.getElementById("demo").innerHTML = Math.sqrt(64);
</script>
​
</body>
</html>
​