对大家有帮助的问答会被标记为“推荐”,看完课程过来浏览一下别人提的问题,会帮你学得更全面
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> for (var i = 1; i <= 9; i++) { document.write("<br/>"); for (var j = 1; i <= j; j++) { document.write(i + "*" + j + "=" + i * j); } } </script> </body> </html>
老师我这有啥问题吗,浏览器老转圈加载不出来
reset和submit事件,为什么reset不用on?submit用on?
是reset不加on不影响吗。
还有就是为什么不加事件只有按钮的话点击按钮也会让内容消失
<input type="text" id="a"> var a = document.getElementById("a"); a.onkeydown = function(e){ console.log(e.keycode); }
老师,我为什么返回的都是undefined
<ul class="topnav"> <li>item 1</li> <li>item 2</li> <li> <ul> <li>children item1</li> <li>children item2</li> </ul> </li> </ul> <script> var topnav = document.getElementsByClassName("topnav")[0]; var children = topnav.chilNodes; for(var i=0;i<children.length;i++){ if(children[i].nodeName!=="#text"){ children[i].style.border = "2px solid red"; } } </script>
添加不了边框,显示
children.length
错误