Javascript 第三章
1 <html>
2 <head>
3 <title></title>
4
5 </head>
6 <body>
7 <form action="test_submit" method="get" accept-charset="utf-8" class="test" id="form1">
8
9 <div class="test"></div>
10 <div class="test"></div>
11
12 </form>
13 <p title="p1">One morning, when Gregor Samsa woke from troubled dreams, he found himself transformed in his bed into a horrible vermin. He lay on his armour-like back, and if he lifted his head a little he could see his brown belly, slightly domed and divided by arches into stiff sections. The bedding was hardly able to cover it and seemed ready to slide off any moment. His many legs, pitifully thin compared with the size of the rest of him, waved about helplessly as he looked. "What's happened to me? " he thought.</p>
14 <p>One morning, when Gregor Samsa woke from troubled dreams, he found himself transformed in his bed into a horrible vermin. He lay on his armour-like back, and if he lifted his head a little he could see his brown belly, slightly domed and divided by arches into stiff sections. The bedding was hardly able to cover it and seemed ready to slide off any moment. His many legs, pitifully thin compared with the size of the rest of him, waved about helplessly as he looked. "What's happened to me? " he thought.</p>
15 <p title="p3">One morning, when Gregor Samsa woke from troubled dreams, he found himself transformed in his bed into a horrible vermin. He lay on his armour-like back, and if he lifted his head a little he could see his brown belly, slightly domed and divided by arches into stiff sections. The bedding was hardly able to cover it and seemed ready to slide off any moment. His many legs, pitifully thin compared with the size of the rest of him, waved about helplessly as he looked. "What's happened to me? " he thought.</p>
16
17 <script>
18 // implement getElementsByClassName
19 function getElementsByClassName(note,classname){
20 // if(!note) equivalent to if (note == null) {};
21 var args = arguments.length;
22 if (args == 1) {
23 classname = arguments[0];
24 note = document;
25 }else if (args == 2) {
26 classname = arguments[1];
27 if (!note) {
28 note = document;
29 }else{
30 note = arguments[0];
31 }
32 }
33
34 classname = classname.toString();
35 if(note.getElementsByClassName){
36 return note.getElementsByClassName(classname);
37 }else{
38 var results = [];
39 var elements = note.getElementsByTagName("*");
40 for (var i = 0,j = elements.length; i < j; i++) {
41 if (elements[i].className.indexof(classname) != -1) {
42 results[results.length] = elements[i];
43 }
44 }
45
46 return results;
47 }
48 }
49
50
51 alert(getElementsByClassName("test").length);
52
53
54 var paras = document.getElementsByTagName("p");
55 for (var i = 0; i < paras.length; i++) {
56 var title_text = paras[i].getAttribute("title");
57 if (title_text) {
58 alert(title_text);
59 }else{
60 paras[i].setAttribute("alt","alt"+(i+1));
61 alert(paras[i].getAttribute("alt"));
62 }
63 }
64 </script>
65 </body>
66 </html>
【推荐】编程新体验,更懂你的AI,立即体验豆包MarsCode编程助手
【推荐】凌霞软件回馈社区,博客园 & 1Panel & Halo 联合会员上线
【推荐】抖音旗下AI助手豆包,你的智能百科全书,全免费不限次数
【推荐】博客园社区专享云产品让利特惠,阿里云新客6.5折上折
【推荐】轻量又高性能的 SSH 工具 IShell:AI 加持,快人一步
· Java 中堆内存和栈内存上的数据分布和特点
· 开发中对象命名的一点思考
· .NET Core内存结构体系(Windows环境)底层原理浅谈
· C# 深度学习:对抗生成网络(GAN)训练头像生成模型
· .NET 适配 HarmonyOS 进展
· 用 DeepSeek 给对象做个网站,她一定感动坏了
· DeepSeek+PageAssist实现本地大模型联网
· 手把手教你更优雅的享受 DeepSeek
· 腾讯元宝接入 DeepSeek R1 模型,支持深度思考 + 联网搜索,好用不卡机!
· 从 14 秒到 1 秒:MySQL DDL 性能优化实战