JavaScript

I recently wrote a small Web ProgramThe format of an input value is verified, for example, whether it is a number, whether it is a positive number, or whether it is an integer. Because the input data in the input box is arbitrary, such as letters

Although the history of using lengthy and annoying code blocks in JavaScript to mark specific browsers has ended, however, it is necessary to occasionally use some simple code blocks and object detection to ensure that some code works normally on

! Remove spaces at both ends of a string If you use the traditional method, you may need to use the following method.// Clear spaces on the leftFunction js_ltrim (deststr){If (deststr = NULL) Return "";VaR Pos = 0;VaR retstr = new string (deststr

1. You can write various assignment statements in your work.For example, the most common obj. style. display = "none ";If there are more than one assignment statement, obj. style will be dizzy in a row. The following extend functions in my base. js

Http://www.webjx.com/htmldata/2005-11-26/1132968209.html) Demo: http://www.webjx.com/htmldata/2005-11-26/test.html  

Original: http://topic.csdn.net/u/20100421/16/817ef7c6-6675-49e1-bf39-b4a96c08b41e.html 1,Convert string to numeric value General MethodCode: Var a = parseFloat ("12 "); Var B = parseInt ("34 "); AvailableCode: Var a = + ("12 "); Var B = + ("3

Cell Object File: Cell. js // JScript source code var $ MIN_ROW = 1, $ MAX_ROW = 65535, $ MIN_COL = 1, $ MAX_COL = 256, $ COL_STEP = 26; // -------------- Cell --------------- function Cell (addrStr, absoluteAddr) { this. set_ClassName ("Cell"

OperatorUnaryBase unary operator base type File: OperatorUnaryBase. js Function OperatorUnaryBase () { this. deriveFrom (new OperatorBase (); this. set_ClassName ("OperatorUnaryBase"); this. _ type = new UnaryType ("undefined"); };

Operator priority Definition File: OperatorBase. js // JScript source code var $ OperatorPriority = { // Logic "|": 0, "&": 0, // Compare ">": 1, "> =": 1, " " // Logic compute "|": 2, "&": 2, "^": 2, // Mathematic "+": 3, "-": 3, "*":

Arithmetic Operators include +,-, *,/, and %.   Arithmetic Operators File: OperatorMathematic. js Function OperatorMathematic () { this. deriveFrom (new OperatorBinaryBase (); this. set_ClassName ("OperatorMathematic"); this. set_Sign ("undefined")

Comparison operator base class File: OperatorCompareBase. js Function operatorcomparebase () { This. derivefrom (New operatorbinarybase (); This. set_classname ("operatorcomparebase"); This. set_sign ("operatorcomparebase"); This. _

Thank you for your comments and suggestions! greedy JavaScript greedy snake By Zhang Bing

Character string combinations are often used during software development. Let's take a look at a common character string combination: Var strName = 'zhang san '; Var strTableName = 'mytable '; Var strSql = "select * from" + strTableName + "where

Function checkuser () { VaR OBJ = Document. getelementbyid ("checkuser "); VaR STR = Document. getelementbyid ("txtusername"). value; OBJ. classname = "right "; OBJ. innerhtml = 'checking. Please wait ...'; If (Str. Length = 0) { Checkuser = "false "

 Function CheckPsw () ...{ Var p = document. getElementById ("TxtPsw"). value; If (p. length = 0) ...{ CheckPsw = "false "; SetCheckPsw (checkPsw ); Return; } Var Expression =/^ [A-Za-z0-9] + $ /; Var regExp = new RegExp (Expression ); If (regExp.

Function checkemail () ...{ VaR OBJ = Document. getelementbyid ("checkemail "); VaR email = Document. getelementbyid ("txtemail"). value; OBJ. classname = "right "; OBJ. innerhtml = 'checking. Please wait ...'; If (email. length> 0) ...{ VaR

When the query string is used in the url, the square question is translated and some related information is checked. Basically, the server that uses js is used. encode (); server. decode (); Use the url for sending and receiving

Write a javascript timer Requirement: Write a javascript timer: it shocould alert a diert after certain timer, the dialog has two buttons. click one of them, the page will refresh automatically; click the other, nothing will happen. Deploy it on

Based on prototype. js, v1.6 It is hard to understand how to dynamically bind events to elements. I found the bind method on the Internet, and it is difficult to understand when the dynamic binding method needs to add parameters.Using this method

VaR JS = Document. createelement ("script "); JS. ID = "tmpjs "; JS. src = "/prototype. js "; Document. getelementsbytagname ("head") [0]. appendchild (JS ); In this way, if alert (prototype) is enabled immediately, the prototype is undefined.