JavaScript

JavaScript Regular Expression Test Web page How do you normally test regular expressions? Write directly in a large section of code, then wait for the program to run there, and then display the results with alert? Or do you write a page temporarily

Each () is used to iterate through each element and make the appropriate processing, the following is a simple implementation: Method One (direct function call): The code is as follows Copy Code function each (OBJ,FN)

Let's take a look at the regular rules. Text /^ (\d+) $/corresponds to "pure digits"/^ ([a-za-z]+) $/corresponds to "pure letter"/^ ([a-za-z].+) $/corresponds to "beginning of letter + any character"/^ ([0-9a-za-z]+) $/corresponds to "number +

One: ability detection (characteristic detection) Ability detection is not the ability to identify a particular browser, but to identify the browser. Two: Eccentricity detection Unlike the ability to detect, it is mainly to identify browser bugs,

Only the first "a" letter can be replaced Can replace All "a" letters

The first, using Math.Round The code is as follows Copy Code var original=28.4531)//round "original" to two decimalsvar result=math.round (original*100)/100; Returns 28.452)//Round "original" to 1 decimalvar

Here's a relatively simple way to realize this: a container demo that sets the width and hides content that extends beyond its width, where demo1 and demo2,demo1 are scrolling content, Demo2 for Demo1 direct cloning, By constantly changing the demo1

The code is as follows Copy Code Document.body.offsetWidthDocument.body.offsetHeight In a browser that declares DOCTYPE, you can use the following to get the browser display window size: The code is as follows

1, AppendChild Adds a node to an array of child nodes of the specified node Usage: target.appendchild (newchild)Newchild inserts the last child node as a child node of target Take a look at this simple example: Add a child node div at the end of

Performance improvement and analysis of Web page special effects undefined At work we often need to determine whether a variable/attribute is undefined. There are usually two ways of writing1//Mode 12 typeof age = = ' undefined ';34//Mode 25 Age = =

Web page effects datetime time operation functionHtml datetime and TimeSpan       Js/*similar to. NET ' s DateTime class--slchen*/function DateTime () {this.year = 0;This.month = 0;This.day = 0;This.hour = 0;This.minute = 0;This.second =

Web page effects implement XML and string transform each otherThese two functions are more practical ah, you can implement XML and string to transform each other Oh, there is a lot of it to deal with the XML and characters is very convenient.

Test environment (client browser)IE6,IE7, IE8 compatibility mode, IE8Firefox 3.6.8, Google Chrome 5.0.375.125 The standard definitions of two functions are described first.Elementnode.setattribute (Name,value)Name required. Specify the name of the

When a Web page effects object is generated: such as: function BB (a) {This.a= "KKK"} var b=new bb ();At this time B is the object has the BB attribute prototype to the prototype object;The prototype object has a constructor attribute pointing to

JavaScript Uninterrupted picture Scrolling code Speed (ms)var Speed = 10;Per move (px)var space = 5;Width per pagevar pagewidth = 132;Overall shift (PX)var fill = 0;Whether to move automatically, true moves, false does not movevar movelock =

Array.prototype.binarySearch = function (obj) { var value = 0; var left = 0; var right= this.length; while (left { var center = Math.floor ((left+right)/2); if (this[center] = obj) { value = center; } if (obj { right = center-1; } Else {

JavaScript indexof function with square Definitions and usageThe IndexOf () method returns the location of the first occurrence of a specified string value in a string. GrammarStringobject.indexof (searchvalue,fromindex) parameter

Tip: you can modify some code before running Javascript-based WEB editor Sample button Enter the content to edit Another button Click on the button below to select all buttons with the controlRange

// Step 4: sort the columns and related forums. The basic idea is to re-combine the arrays.Function On_OrderUp ()    {Var CategoryIndex = frmManager. selCategoryName. selectedIndex;Var ForumIndex = frmManager. selForumName. selectedIndex;If

Cart. jsSave it as cart. js and put it in the same directory as the previous html.//------------------------------------------------------------------------------//// File name: cart. js//// Description: Use the javascript function library at the