Compiled relatively good JavaScript methods and techniques_Basic knowledge

Suitable reading range: People who know nothing about JavaScript ~ only one step away from mastering
Basic knowledge: HTML


That’s all JavaScript 1: Basic knowledge

1 Create script block

1:



2 Hidden script code

1:


Relevant code will not be executed in browsers that do not support JavaScript

3 Displayed when the browser does not support it

1:



4 Link external script files

1:


5 Comment script

1: // This is a comment
2: document.write(“Hello”); // This is a comment
3: /*
4: All of this
5: is a comment
6: */



6 Output to browser

1: document.write( "Hello");



7 Define variables

1: var myVariable = “some value”;



8 String addition

1: var myString = “String1” “String2”;



9 String search

1:



10 characters String replacement

1: thisVar.replace(“Monday”,”Friday”);


11 Format string

1:



12 Create array

1:



13 Array sorting

1:  



14 分割字符串

1: 
2: 
10:  



15 弹出警告信息

1: 
2: 
5:  



16 弹出确认框

1: 
2: 
5:  



17 定义函数

1: 
2: 
8:  



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:  

JavaScript就这么回事2：浏览器输出 


26 访问document对象

1: 
2: var myURL = document.URL;
3: window.alert(myURL);
4:  



27 动态输出HTML

1: 
2: document.write(“

Here's some information about this document:

”);
3: document.write(“

”);
4: document.write(“
• Referring Document: “   document.referrer   “
”);
5: document.write(“
• Domain: “   document.domain   “
”);
6: document.write(“
• URL: “   document.URL   “
”);
7: document.write(“

”);
8:  


28 输出换行

1: document.writeln(“a”);
2: document.writeln(“b”); 



29 输出日期

1: 
2: var thisDate = new Date();
3: document.write(thisDate.toString());
4:  



30 指定日期的时区

1: 
2: var myOffset = -2;
3: var currentDate = new Date();
4: var userOffset = currentDate.getTimezoneOffset()/60;
5: var timeZoneDifference = userOffset - myOffset;
6: currentDate.setHours(currentDate.getHours()   timeZoneDifference);
7: document.write(“The time and date in Central Europe is: “   currentDate.toLocaleString());
8:  


31 设置日期输出格式

1: 
2: var thisDate = new Date();
3: var thisTimeString = thisDate.getHours()   “:”   thisDate.getMinutes();
4: var thisDateString = thisDate.getFullYear()   “/”   thisDate.getMonth()   “/”   thisDate.getDate();
5: document.write(thisTimeString   “ on “   thisDateString);
6:  


32 读取URL参数

1: 
2: var urlParts = document.URL.split(“?”);
3: var parameterParts = urlParts[1].split(“&”);
4: for (i = 0; i < parameterParts.length; i ) { 
5: var pairParts = parameterParts[i].split(“=”);
6: var pairName = pairParts[0];
7: var pairValue = pairParts[1];
8: document.write(pairName   “ ：“  pairValue );
9: }
10:  

你还以为HTML是无状态的么？

33 打开一个新的document对象

1: 
2: function newDocument() { 
3: document.open();
4: document.write(“

This is a New Document.

”);
5: document.close();
6: }
7:  



34 页面跳转

1: 
2: window.location = “http://www.php.cn/”;
3:  



35 添加网页加载进度窗口

1: 
2: 
3: 
4: var placeHolder = window.open('holder.html','placeholder','width=200,height=200');
5: 
6: 
7: 
8: 
9: 

This is the main page

10: 
11: 
JavaScript就这么回事3：图像 



36 读取图像属性

1: 
2: Width
3: 


37 动态加载图像

1: 
2: myImage = new Image;
3: myImage.src = “Tellers1.jpg”;
4:  


38 简单的图像替换

1: 
2: rollImage = new Image;
3: rollImage.src = “rollImage1.jpg”;
4: defaultImage = new Image;
5: defaultImage.src = “image1.jpg”;
6: 
7: 8: onMouseOut=”document.myImage.src = defaultImage.src;”>
9:  


39 随机显示图像

1: 
2: var imageList = new Array;
3: imageList[0] = “image1.jpg”;
4: imageList[1] = “image2.jpg”;
5: imageList[2] = “image3.jpg”;
6: imageList[3] = “image4.jpg”;
7: var imageChoice = Math.floor(Math.random() * imageList.length);
8: document.write(‘');
9:  


40 函数实现的图像替换

1: 
2: var source = 0;
3: var replacement = 1;
4: function createRollOver(originalImage,replacementImage) { 
5: var imageArray = new Array;
6: imageArray[source] = new Image;
7: imageArray[source].src = originalImage;
8: imageArray[replacement] = new Image;
9: imageArray[replacement].src = replacementImage;
10: return imageArray;
11: }
12: var rollImage1 = createRollOver(“image1.jpg”,”rollImage1.jpg”);
13: 
14: 15: onMouseOut=”document.myImage1.src = rollImage1[source].src;”>
16: 
17:  


41 创建幻灯片

1: 
2: var imageList = new Array;
3: imageList[0] = new Image;
4: imageList[0].src = “image1.jpg”;
5: imageList[1] = new Image;
6: imageList[1].src = “image2.jpg”;
7: imageList[2] = new Image;
8: imageList[2].src = “image3.jpg”;
9: imageList[3] = new Image;
10: imageList[3].src = “image4.jpg”;
11: function slideShow(imageNumber) { 
12: document.slideShow.src = imageList[imageNumber].src;
13: imageNumber  = 1;
14: if (imageNumber < imageList.length) { 
15: window.setTimeout(“slideShow(“   imageNumber   “)”,3000);
16: }
17: }
18: 
19: 
20: 
21:  


42 随机广告图片

1: 
2: var imageList = new Array;
3: imageList[0] = “image1.jpg”;
4: imageList[1] = “image2.jpg”;
5: imageList[2] = “image3.jpg”;
6: imageList[3] = “image4.jpg”;
7: var urlList = new Array;
8: urlList[0] = “http://www.php.cn/”;
9: urlList[1] = “http://www.php.cn/”;
10: urlList[2] = “http://www.php.cn/”;
11: urlList[3] = “http://www.php.cn/”;
12: var imageChoice = Math.floor(Math.random() * imageList.length);
13: document. write('');
14:
JavaScript That’s It 4: Form


Let’s continue writing the JS That’s It series first~
43 Form Composition

1 :

2:
3: < select name=”mySelect”>
4: First Choice
5: Second Choice
6:
7:

8:
9:


44 Access the text box content in the form

1:
2:
3:

4: Check Text Field


45 Dynamically copy text box content

1:

2: Enter some Text: < input type=”text” name=”myText”>

3: Copy Text:
4:
5: 6: document.myForm.myText.value;”>Copy Text Field


46 Detect changes in text box

1:
2: Enter some Text:
3:

47 Access the selected Select

1:

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

8: Check Selection List


48 Dynamically add Select items

1:

2:
3: 1
4: 2
5:
6: < ;/form>
7:
9:
10: Text Field:
11:

12:

50 Verify Select items

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: 
2: 
17: 
18: 
19: Enter Some Text: 
20:  




JavaScript就这么回事5：窗口和框架 


54 改变浏览器状态栏文字提示

1: 
2: window.status = “A new status message”;
3:  


55 弹出确认提示框

1: 
2: var userChoice = window.confirm(“Click OK or Cancel”);
3: if (userChoice) { 
4: document.write(“You chose OK”);
5: } else { 
6: document.write(“You chose Cancel”);
7: }
8:  


56 提示输入

1: 
2: var userName = window.prompt(“Please Enter Your Name”,”Enter Your Name Here”);
3: document.write(“Your Name is “   userName);
4:  


57 打开一个新窗口

1: //打开一个名称为myNewWindow的浏览器新窗口
2: 
3: window.open(“http://www.php.cn/”,”myNewWindow”);
4:  


58 设置新窗口的大小

1: 
2: window.open(“http://www.php.cn/”,”myNewWindow”,'height=300,width=300');
3:  


59 设置新窗口的位置

1: 
2: window.open(“http://www.php.cn/”,”myNewWindow”,'height=300,width=300,left=200,screenX=200,top=100,screenY=100');
3:  


60 是否显示工具栏和滚动栏

1:


62 Load a new document into the current window

1: Open New Document


63 Set the scroll position of the page

1:


64 Open a full-screen window in IE

1: Open a full-screen window


65 New window and parent window operations

1:
6: In the new window Close the parent window in the window
7: window.opener.close()


66 Write content in the new window

1:


67 Load the page into the frame page

1:
2:
3:
4:
5: Load the page in frame2 in frame1
6: parent.frame2.document.location = " 135b.html";


68 Sharing scripts between frame pages
If there is a script in the html file in frame1

1: function doAlert() {
2: window.alert(“Frame 1 is loaded”);
3: }

Then the method can be called like this in frame2

1:
2: This is frame 2.
3:


69 Data public
can be found on the frame page Define data items so that the data can be shared by pages in multiple frames

1:
4:
5:
6:
7:


This way in frame1 Variables persistentVariable can be used in both frame2 and frame2
70 Framework code base
According to some of the above ideas, we can use a hidden frame page as the code base of the entire frame set

1: < frameset cols="0,50%,*">
2:
3:
4:
5: