JavaScript

Event-driven events in JavaScript are triggered by mouse or hot key actions as follows: 1. Click the event onclick as follows: () It is usually used for the following controls: Button ObjectCheckbox check box or check list-with onclick click

Javascript uses regular expressions to implement startwith and endwith Functions CopyCode The Code is as follows: String. Prototype. startwith = function (STR ){ VaR Reg = new Regexp ("^" + Str ); Return Reg. Test (this ); } String. Prototype.

Knowledge point: Array method: Sort: Descending Reverse: reverse Order Effect: Code: Copy codeThe Code is as follows: item name product description mounting time price operation 1 12312312313 2013-5-8 ￥120 Delete 2 top wear 2013

As follows: Page code: Copy codeThe Code is as follows: Display Effect of Baidu youah topic graph boxing do not trap yourself. You need to release it! overall evaluation: User impression: active active User rating

The following function receives a parameter, which can be an array or an element and returns the text of the element. Copy codeThe Code is as follows: function text (e ){ Var str = ""; // If an element is input, obtain its child element. //

Var reg =/regular expression /; Boolean reg. test (string to be verified ); The js engine converts/Regular Expressions/"" into a RegExp object. If the string meets the requirements of regular expressions, true is returned. An example of expression

Html dom refers to some dom operations supported by various browsers before w3c standards emerge. 1. Select object. Attribute A, selectedIndex: subscript of the selected option. The subscript starts from 0. B, length: Get or set the number of

I. concepts: 1. The mouse event has a botton attribute: return an integer to indicate which mouse button is clicked.BUG: in IE and standard DOM mouse events, the only event with the same button property value is the "right-click" event, both return 2

The encapsulated motion frame Move (obj, attr, iTarget) can be called directly: It can be used to set variable speed changes of many common attribute values, such as width, border, fontSize, marginLeft, and opacity, to achieve a variety of

Inheritance Method ECMAScript implements inheritance in more than one way. This is because the Inheritance Mechanism in JavaScript is not clearly defined, but achieved through imitation. This means that all inheritance details are not completely

Declared global variables in JS are mainly divided into explicit declaration or implicit declaration. Method 1: Using var (keyword) + variable name (identifier) is declared outside the function, that is, global variables. Otherwise, local variables

Variable naming rules should also comply with the following famous naming rules: Famous variable naming rulesCamel taggingThe first letter is lowercase, and the subsequent letters start with an uppercase letter. For example: Copy codeCode: var

I. Basic Concepts EncodeURI and decodeURI are used in pairs. Because the address bar of the Browser contains Chinese characters, unexpected errors may occur. Therefore, encodeURI can convert non-English characters into English encoding, decodeURI

In JS, the Create Object is not exactly the class Object that we often call to Create. The objects in JS emphasize a composite type, creating objects in JS and accessing objects are extremely flexible. Javascript objects are a composite type that

Recently, more and more users have emphasized the interaction of the UI interface. JavaScript (JS), which is just a supporting role, has gradually become the main character for a dragon and occupies a major role. For example, the recently popular

I am writing a DEMO today, where $. after the getJSON method is completed, it is found that jQuery is used in the entire DEMO, but it is not cost-effective to introduce a jQuery method. Therefore, a simple version is implemented by yourself, the

1. embedded into HTML1. Place the Javascript code directly between 2. Create an external js File Based on the src attribute marked by 4. In the same script, the function definition can appear after the function call, but if it is in two sections of

Generally, the two call results are the same, but there are still differences. Method 1: Copy codeThe Code is as follows: function (){ Alert ('Old '); } Var B =; Function (){ B (); Alert ('new '); } A (); // memory overflow occurs in the

Constructor Copy codeThe Code is as follows: function coder () { This. name = 'modern magic '; This. job = 'web developer '; This. coding = function () {Alert ('Code I am writing ');} } Var coder = new coder ();Alert (coder. name );Coder. coding ();

Copy codeThe Code is as follows: automatically downloading files from js to a local device