<!DOCTYPE html> <html> <body> <h1>JavaScript 数字</h1> <h2>toFixed() 方法</h2> <p>toFixed() 将数字转换为字符串,四舍五入到指定的小数位数:</p> <p id="demo"></p> <script> let num = 5.56789; let n = num.toFixed(2); document.getElementById("demo").innerHTML = n; </script> </body> </html>