JavaScript

The content of the original json file is:{Label: 'Europe (EU27 )',Data: [[1999, 3.0], [2000, 3.9], [2001, 2.0], [2002, 1.2], [2003, 1.3], [2005, 2.0], [2006, 3.1], [2007, 2.9], [2008, 0.9]}Solution 1:To be changed to the standard json format, you

1. shift: Delete the first entry of the original array and return the value of the deleted element. If the array is empty, undefined is returned. Var a = [1, 2, 3, 4, 5];Var B = a. shift (); // a: [2, 3, 4, 5] B: 12. unshift: add the parameter to

(This does not mean that jQuery has excellent performance. On the contrary, it can only be said that it is a relatively closed library and cannot be optimized by external intervention ). This article records a failed optimization

Copy codeThe Code is as follows: In IE, "unknown runtime error" may sometimes occur, but not in firefox.This is mainly because when IE writes innerHTML, it will check whether the element meets the requirements of the html object container in the

Implement the innerText attribute for firefoxA lot of code has been written, forgotten, and written, which is a waste of resources, so I decided to develop the habit of taking notes.Knowledge point:0. Why innerText? Security problems1. Extend

Today we will mainly discuss how to encapsulate data in JavaScript scripts ).Data encapsulation simply hides content that the caller does not want to see. It is the first of the three elements of object-oriented programming. The other two are

Substr Method Returns a substring of the specified length starting from the specified position.Stringvar. substr (start [, length])ParametersStringvarRequired. The String text or String object to extract the substring.StartRequired. The starting

5% 10 = 5X = "5" + "5 ";X = "5" + 5;Document. write (x); (the result is: 55)Undefined is the value of an uninitialized variable. It has no reference value, which is beyond undefined.Var anyway; anyway was specified to have a null

The direct character count of the regular expression.Character matchingAlphanumeric characters themselves\ O NUL character (\ u0000)\ T-bit table (\ u0009)\ N linefeed (\ u000A)\ V vertical bit table (\ u000B)\ F page feed (\ u000C)\ R press enter (\

However, we are not familiar with some details. After analyzing these details, John Resig provides us with a perfect solution. This article will introduce in detail:I. Unknown details about traditional methodsUndoubtedly, when determining the

Next, record the method used by JS to control CSS.1. Use javascript to change the attributes of a css class...You want to change the display attribute from none to inline.Solution: in IE:Document. styleSheets [0]. rules [0]. style. display = "inline

Remaining Time: 1 hour: 40 minutes: 30 secondsCopy codeThe Code is as follows:1 /** Countdown plug-in, mainly used for time-limited purchase* By wayshan Version 1.0* Usage:* $ (Function (){* $ ("# ElementId"). countdown ({* Edate: "15:14:23"*});*})*/

For JavaScript magnifiers, the computing rate is essential.In a complete magnifier structure, there are a total of four objects related to the magnification, the source image, the thumbnail, the lens and the window. the lens's coverage on the

The Code is as follows:Copy codeThe Code is as follows:$ ("# Money"). bind ("propertychange", function (){If (""! = This. value ){Var str = this. value. replace (/(^ \ s *) | (\ s * $)/g ,"");If (this. value! = Str)This. value = str;}If (isNaN

① Relative positioning of jQuery elements.In jQuery, you can not only use the selector to perform absolute positioning, but also perform relative positioning. As long as you specify the second parameter in $ (), the second parameter is the relative

First, check all the complete code: countDown test end date [Ctrl + A select all Note: If you need to introduce external Js, You need to refresh it to execute]Some html code:You can enter the countdown time in the text box. If the

ONE The generated data table is roughly as follows: Region Region Product Code Product Name Quantity Valid till Validity Period (month) Product batch number

In IE6/7/8/9, the innerHTML value of Table/Select reports an error, as shown below: innerHTML of TABLE in IE6/7/8/9 cannot be assigned a value [Ctrl + A select all Note: If you need to introduce external Js, You need to refresh it to

1. A parameter is an object. The core js object (native ECMAScript object) or host object will be returned directly.The object constructor generated by the constructor is still the constructor of the passed parameter object. The consequence is that

I. Introduction Copy codeThe Code is as follows:Var a = {n: 1 };A. x = a = {n: 2 };Alert (a. x); // --> undefined This is the method Cai found when reading jQuery source code. The second sentence a. x = a = {n: 2} above is a continuous value