<!DOCTYPE html> <html> <body> <h1>JavaScript 数字</h1> <h2>parseFloat() 方法</h2> <p>Number.parseFloat() 将字符串转换为数字:</p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = Number.parseFloat("10") + "<br>" + Number.parseFloat("10.33") + "<br>" + Number.parseFloat("10 20 30") + "<br>" + Number.parseFloat("10 years") + "<br>" + Number.parseFloat("years 10"); </script> </body> </html>