W3School TIY Editor
W3School 在线教程
改变方向
暗黑模式
运行代码
<!DOCTYPE html> <html> <body> <h2>JavaScript while</h2> <p id="demo"></p> <script> var text = ""; var i = 0; while (i < 10) { text += "<br>数字是 " + i; i++; } document.getElementById("demo").innerHTML = text; </script> </body> </html>