JavaScript

You can use the following functions when you need to Cheng a fixed length in front or behind when outputting integers. Copy Code code as follows: function PadLeft (str,lenght) { if (str.length >= lenght) return str; Else

1 Creating var xlobj = new ActiveXObject ("Excel.Application"); var xlbook = XLObj.Workbooks.Add; New Workbook var excelsheet = xlbook.worksheets (1); Create a worksheet 2. Save the form Excelsheet.saveas ("C:\\test.") XLS "); 3. Make Excel

Objective BMI index (Body Mass index), is a standard commonly used internationally to measure the level of weight and fitness of the human body, and when we need to compare and analyze the health effects of a person's weight on people of different

Front. One day on a whim, 1 minutes repeatedly clicked on the blog home page Refresh blog list refresh button. Sure enough, IP was disabled at the time. Later, restart your router and retrieve the IP to access the blog's home page. Would it be

Usually encounter the problem of tree structure, such as the display directory structure. In most cases, the background returns such data as follows: [ {id:19, pid:0, Name: ' Nodejs '}, {id:20, pid:19, Name: ' Express '}, {id:21, pid:19,

javascript getelementbytagname use DFDFD dfdfd DFDFD [Ctrl + A All SELECT Note: If the need to introduce external JS need to refresh to perform]

Scope of a variable To understand closures, you must first understand JavaScript's special variable scope. The scope of a variable is nothing more than two kinds: global and local variables. The special point of the JavaScript language is that

JS complex array associative array and objects are equivalent, to determine whether a key exists in the array (or whether the object contains a property), can not use ary[key] = = Undefined, because there may be ary = {key:undefined}; The correct

To determine the status of a mobile phone screen: function hengshuping () { if (window.orientation==180| | window.orientation==0) { alert ("Vertical screen state!") ") } if (window.orientation==90| | WINDOW.ORIENTATION==-90) { alert ("Horizontal

Actually this is a cliché question. About this article is very many, in fact, I thought I had already understood it, but yesterday in the process of doing the project, or appeared a trace of doubt, think about before the JavaScript weekly in the

Usually we get the event object generally written as follows: Copy Code code as follows: function GetEvent (event) { Return Event | | Window.event//IE:window.event } If there are no arguments, it can be written (non ie:

Weak-type JavaScript does not convert from the actual variable type to the desired data type according to the programmer's wishes, such as a very common error, in the browser script, Gets and from the form control the variable of a numeric type to

First, simplify the codeWith a shorter wording, not only can you reduce the number of characters you enter, but you can also reduce the file size. Most of the code is simple to use, the efficiency of implementation has been slightly improved. 1.1

Raphael is a Javascript library that is used to draw vector graphics in a Web page. It uses SVG recommended standards and VML as the basis for creating graphics, you can easily create a variety of complex columns, pie charts, graphs, and other

Read xml: Copy Code code as follows: Text1 Text2 Text3 JavaScript parses this XML in the following ways: Copy Code code as follows:

Copy Code code as follows: parseint ("Hello");//return NAN parseint ("//return"); 110 So the simple way to judge whether a string is a number is to take advantage of isNaN (), and if true, the string is not a number, otherwise it is a

Copy Code code as follows: Async = {}; async.operation = function (options) { options = Options | | {}; var callbackqueue = []; var chain = (Options.chain && Options.chain = = True)? True:false; var started = false; var innerchain = null;

Needless to say, the key code looks like this: ---recovery start--- ;form> ---recovery content end--- The above is a small series to introduce the JavaScript form Focus automatic switch code, I hope to help you!

Delivery Callback One of the first things we have to consider is how to pass the callback entry. In the most traditional xhr invocation, the callback function is passed as the last argument to the asynchronous function: Copy Code code as

problem In AJAX applications, calling XMLHttpRequest is a common case. In particular, client-centric AJAX applications, various operations that need to obtain data from the server are completed by XHR asynchronous calls. However, in single-threaded