JavaScript

If (reValue = undefined ){Alert ("undefined ");}The system found that the data could not be determined, and finally found the information to use the typeof method:If (typeof (reValue) = "undefined "){Alert ("undefined "); } Typeof returns a string,

JavaScript split () function

Recently, my colleague asked me how to add variables to the Regular Expression in js, and wrote a blog record. I. Literally, when we define a string, an array, an object, and so on, we are used to defining it with a literal, for example: var s =

Copy codeThe Code is as follows:$. Ajax ({Type: "POST ",Url: "some. php ",Data: "name = John & location = Boston", // The first method for passing Parameters// Data: {name: "John", location: "Boston"} // The second method for passing Parameters//

This article takes the station name search as an example to look for the effect of the station ticket time page on the official website of imitation 12306. When a user enters a keyword and clicks the search button or presses the Enter key, jQuery

Copy codeThe Code is as follows:// 1. Get and set the style $ ("# Tow"). attr ("class") gets the class attribute whose ID is tow. $ ("# Two"). attr ("class", "divClass") sets the class attribute whose Id is two. // 2. append a style $ ("# Two").

Sometimes, we may not Enter your name: Jquery gets the name

Object creation:When a Function object is created, the Function object generated by the Function constructor runs code similar to this:Copy codeThe Code is as follows:This. prototype = {constructor: this }; Assume that function FF when constructing

Html code structure: Copy codeThe Code is as follows: Style: Copy codeThe Code is as follows:A {width: 300px; height: 300px; background: # fff; border: 1px solid #666; display: inline-block}/* specify the height and width of the tag, optional

Prerequisites: You need to import the relevant js file jquery. js$. Post (url, data, success (data, textStatus, jqXHR), dataType)Url: required. Specifies the URL to which the request is sent.Data: Optional. Ing or string value. Specifies the data

Copy codeThe Code is as follows:Var wait = 60; // timeFunction time (o, p) {// o is the button object, p is optional, here is 60 seconds later, prompting text changesIf (wait = 0 ){O. removeAttr ("disabled ");O. val ("click to send verification code"

Functions are not familiar to our programmers. We can write and use functions almost every day. But in javascript, how many function call statements do you know? At work, there are only one or two commonly used function call statements. That's why

This article mainly introduces how to access JavaScript class attributes. For more information, seeThe code for accessing JavaScript class attributes is as follows: var fish = {head: 1, tail: 1, feature: {speak: false, swim: true} First, vertex

The fierce competition among various browsers means that more and more people are now using devices that support the latest and most advanced W3C Web standards to access the Internet in a more interactive way. This means that we can finally use the

This article mainly introduces the transfer of values between a new JavaScript window and a subwindow. For more information, seeWindow. open () support environment: JavaScript1.0 +/JScript1.0 +/Nav2 +/IE3 +/Opera3 + window. open (pageURL, name,

The parameters passed in the request's ajax path (data) will be received by a variable with the same name (with the set get method) in the action. The returned data is a JQuery array object, the data variables involved in the called action will be

Abstract: The loop counter in the for-in traversal mode is of the string type. When the object is traversed, the object property/method name is used. When the array is traversed, the array element subscript index is used, which is different from the

Step 1:Remove JS verification from eclipse:Choose windows> preference> Java Script> Validator> Errors/Warnings>Enable Javascript Sematic validation; Step 2:Right-click the project and choose properties> Builders to remove the check mark before

Access Method of JavaScript attributesCopy codeThe Code is as follows:Var fish = {Head: 1,Tail: 1,Feature :{Speak: false,Swim: true}} First, the vertex OPERATOR:Copy codeThe Code is as follows:Console. log (fish. head); // 1Console. log (fish. tail);

JS section:Copy codeThe Code is as follows:Function next (){// Obtain the table objectVar oTable = document. getElementById ("table1 ");// Insert trVar oTr = oTable. insertRow ();// Insert 3 td objects in one row of trVar oTd1 = oTr. insertCell