In JavaScript, you can use the sqrt() method to perform root calculations. This method can return the square root of a specified number. The syntax is "Math.sqrt(value)". When the value in the function is a negative number, The result returned is "NaN".
The operating environment of this tutorial: Windows 10 system, JavaScript version 1.8.5, Dell G3 computer.
The sqrt() method can return the square root of a number.
Syntax
Math.sqrt(x)
Parameter Description
x Required. Must be a number greater than or equal to 0.
Return value
Number/NaN The square root of parameter x. If x is less than 0, returns NaN.
The example is as follows:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>
<p id="demo">单击按钮显示不同数值的平方根。</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction(){
var a=Math.sqrt(0);
var b=Math.sqrt(1);
var c=Math.sqrt(9);
var d=Math.sqrt(64);
var e=Math.sqrt(-9);
var x=document.getElementById("demo")
x.innerHTML=a + "<br>" + b + "<br>" + c + "<br>" + d + "<br>" + e;
}
</script>
</body>
</html>Output result:
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