源代码 ：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>开源教程(ossoft.cn)</title> </head> <body> <p id="demo"></p> <script> var x = 0.1; var y = 0.2; var z = x + y; document.getElementById("demo").innerHTML = z; </script> </body> </html>
运行结果