js 使用方法与函数 总结_javascript技巧

js使用方法小结，比较不错，无论是新手，还是老手都是不错的。

1 创建脚本块
1:
2 隐藏脚本代码
1:
在不支持JavaScript的浏览器中将不执行相关代码
3 浏览器不支持的时候显示
1:

4 链接外部脚本文件
1:
5 注释脚本
1: // This is a comment
2: document.write(“Hello"); // This is a comment
3: /*
4: All of this
5: is a comment
6: */
6 输出到浏览器
1: document.write(“Hello");
7 定义变量
1: var myVariable = “some value";
8 字符串相加
1: var myString = “String1" + “String2";
9 字符串搜索
1:
10 字符串替换
1: thisVar.replace(“Monday","Friday");
11 格式化字串
1:
12 创建数组
1:
13 数组排序
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14 分割字符串
1:
15 弹出警告信息
1:
16 弹出确认框
1:
17 定义函数
1:
18 调用JS函数
1: Link text
2: Link text
19 在页面加载完成后执行函数
1:
2: Body of the page
3:
20 条件判断
1: <script> <br/>2: <!-- <br/>3: var userChoice = window.confirm(“Choose OK or Cancel"); <br/>4: var result = (userChoice == true) ? “OK" : “Cancel"; <br/>5: document.write(result); <br/>6: // --> <br/>7: </script>
21 指定次数循环
1: <script> <br/>2: <!-- <br/>3: var myArray = new Array(3); <br/>4: myArray[0] = “Item 0"; <br/>5: myArray[1] = “Item 1"; <br/>6: myArray[2] = “Item 2"; <br/>7: for (i = 0; i < myArray.length; i++) { <br/>8: document.write(myArray[i] + “<br>"); <br/>9: } <br/>10: // --> <br/>11: </script>
22 设定将来执行
1: <script> <br/>2: <!-- <br/>3: function hello() { <br/>4: window.alert(“Hello"); <br/>5: } <br/>6: window.setTimeout(“hello()",5000); <br/>7: // --> <br/>8: </script>
23 定时执行函数
1: <script> <br/>2: <!-- <br/>3: function hello() { <br/>4: window.alert(“Hello"); <br/>5: window.setTimeout(“hello()",5000); <br/>6: } <br/>7: window.setTimeout(“hello()",5000); <br/>8: // --> <br/>9: </script>
24 取消定时执行
1: <script> <br/>2: <!-- <br/>3: function hello() { <br/>4: window.alert(“Hello"); <br/>5: } <br/>6: var myTimeout = window.setTimeout(“hello()",5000); <br/>7: window.clearTimeout(myTimeout); <br/>8: // --> <br/>9: </script>
25 在页面卸载时候执行函数
1:
2: Body of the page
3:

26 访问document对象
1:
27 动态输出HTML
1:
28 输出换行
1: document.writeln(“a");
2: document.writeln(“b");
29 输出日期
1:
30 指定日期的时区
1:
31 设置日期输出格式
1:
32 读取URL参数
1:
你还以为HTML是无状态的么？
33 打开一个新的document对象
1:
34 页面跳转
1:
35 添加网页加载进度窗口
1:
2:
3:
6:
7:
8:
9:

This is the main page

10:
11:

36 读取图像属性
1:
2: Width
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37 动态加载图像
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38 简单的图像替换
1:
7: 8: onMouseOut="document.myImage.src = defaultImage.src;">
9:
39 随机显示图像
1:
40 函数实现的图像替换
1:
14: 15: onMouseOut="document.myImage1.src = rollImage1[source].src;">
16:
17:
41 创建幻灯片
1:
19:
20:
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42 随机广告图片
1:

43 表单构成
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2:
3:
4: First Choice
5: Second Choice
6:
7:

8:
9:

44 访问表单中的文本框内容
1:

2:
3:

4: Check Text Field
45 动态复制文本框内容
1:

2: Enter some Text:

3: Copy Text:
4:

5: Copy Text Field
46 侦测文本框的变化
1:

2: Enter some Text:
3:

47 访问选中的Select
1:

2:
3: 1
4: 2
5: 3
6:
7:

8: Check Selection List
48 动态增加Select项
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2:
3: 1
4: 2
5:
6:

7:
49 验证表单字段
1:
9:

10: Text Field:
11:

12:

50 验证Select项
1: function checkList(selection) {
2: if (selection.length == 0) {
3: window.alert(“You must make a selection from the list.");
4: return false;
5: }
6: return true;
7: }
51 动态改变表单的action
1:

2: Username:

3: Password:

4:
5:
6:
7:

52 使用图像按钮
1:

2: Username:

3: Password:

4:
5:

6:
53 表单数据的加密
1:
18:

19: Enter Some Text:
20: