要在 JavaScript 中查找数字的平方根,您可以使用内置的
Math.sqrt()
方法。它的语法是:
Math.sqrt(number);
这里,
Math.sqrt()
方法接受一个数字并返回它的平方根。
示例: 数字的平方根
// take the input from the user const number = prompt('Enter the number: '); const result = Math.sqrt(number); console.log(`The square root of ${number} is ${result}`);
输出
Enter the number: 9 The square root of 9 is 3
示例 2: 不同数据类型的平方根
const number1 = 2.25; const number2 =-4; const number3 = 'hello'; const result1 = Math.sqrt(number1); const result2 = Math.sqrt(number2); const result3 = Math.sqrt(number3); console.log(`The square root of ${number1} is ${result1}`); console.log(`The square root of ${number2} is ${result2}`); console.log(`The square root of ${number3} is ${result3}`);
输出
The square root of 2.25 is 1.5 The square root of-4 is NaN The square root of hello is NaN
Math.sqrt()
方法中传递了 0 或正数,则返回该数字的平方根。
如果传递负数,则返回 NaN
。
如果传递了字符串,则返回 NaN
。