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Methods and Techniques for using JavaScript (1)

Source: Internet
Author: User
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1. Create a script block

1: <s required language = "javas alias">
2: javas coding code goes here
3: </s timeout>

 

2. Hide scriptsCode

1: <s required language = "javas alias">
2: <! --
3: Document. Write ("hello ");
4: // -->
5: </s success>

Related code is not executed in browsers that do not support javas libraries.

3 display when the browser does not support

1: <Nos timeout>
2: Hello to the non-javas release browser.
3: </NOS timeout>

 

4. Link an external script file

1: <S release language = "javas release" src = "/" filename. js "> </S release>

5. Comment the 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 the browser

1: Document. Write ("<strong> Hello </strong> ");

 

7. Define Variables

1: var myvariable = "some value ";

 

8 string Addition

1: var mystring = "string1" + "string2 ";

 

9 string SEARCH

1: <s required language = "javas alias">
2: <! --
3: var myvariable = "Hello there ";
4: var thereplace = myvariable. Search ("There ");
5: Document. Write (thereplace );
6: // -->
7: </s timeout>

 

10 string replacement

1: thisvar. Replace ("Monday", "Friday ");

11 format a string

1: <s required language = "javas alias">
2: <! --
3: var myvariable = "Hello there ";
4: Document. Write (myvariable. Big () + "<br/> ");
5: Document. Write (myvariable. Blink () + "<br/> ");
6: Document. Write (myvariable. Bold () + "<br/> ");
7: Document. Write (myvariable. Fixed () + "<br/> ");
8: Document. Write (myvariable. fontcolor ("red") + "<br/> ");
9: Document. Write (myvariable. fontsize ("18pt") + "<br/> ");
10: Document. Write (myvariable. Italics () + "<br/> ");
11: Document. Write (myvariable. Small () + "<br/> ");
12: Document. Write (myvariable. Strike () + "<br/> ");
13: Document. Write (myvariable. sub () + "<br/> ");
14: Document. Write (myvariable. Sup () + "<br/> ");
15: Document. Write (myvariable. tolowercase () + "<br/> ");
16: Document. Write (myvariable. touppercase () + "<br/> ");
17:
18: var firststring = "my string ";
19: var finalstring = firststring. Bold (). tolowercase (). fontcolor ("red ");
20: // -->
21: </s timeout>

 

12. Create an array

1: <s required language = "javas alias">
2: <! --
3: var myarray = new array (5 );
4: myarray [0] = "first entry ";
5: myarray [1] = "second entry ";
6: myarray [2] = "third entry ";
7: myarray [3] = "fourth entry ";
8: myarray [4] = "th entry ";
9: var anotherarray = new array ("first entry", "second entry", "third entry", "fourth entry", "th entry ");
10: // -->
11: </S release>

 

13. Sort Arrays

1: <s required language = "javas alias">
2: <! --
3: var myarray = new array (5 );
4: myarray [0] = "Z ";
5: myarray [1] = "C ";
6: myarray [2] = "D ";
7: myarray [3] = "";
8: myarray [4] = "Q ";
9: Document. Write (myarray. Sort ());
10: // -->
11: </S release>

 

14. Split string

1: <s required language = "javas alias">
2: <! --
3: var myvariable = "A, B, C, D ";
4: var stringarray = myvariable. Split (",");
5: Document. Write (stringarray [0]);
6: Document. Write (stringarray [1]);
7: Document. Write (stringarray [2]);
8: Document. Write (stringarray [3]);
9: // -->
10: </s success>

 

15. A warning message is displayed.

1: <s required language = "javas alias">
2: <! --
3: window. Alert ("hello ");
4: // -->
5: </s success>

 

16 pop-up confirmation box

1: <s required language = "javas alias">
2: <! --
3: var result = Window. Confirm ("Click OK to continue ");
4: // -->
5: </s success>

 

17 define functions

1: <s required language = "javas alias">
2: <! --
3: Function Multiple (number1, number2 ){
4: var result = number1 * number2;
5: return result;
6 :}
7: // -->
8: </s timeout>

 

18. Call JS Functions

1: <a href = "#" onclick = "functionname ()"> link text </a>
2: <a href = "/" javas alias: functionname "()"> link text </a>

 

19. Execute the function after the page is loaded.

1: <body onload = "functionname ();">
2: Body of the page
3: </body>

20 condition judgment

1:
2: 3: var userchoice = Window. Confirm ("Choose OK or cancel");
4: var result = (userchoice = true )? "OK": "cancel";
5: document. write (result);
6: // -->
7:

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