JavaScript

Recently, the company's project needs to do some webim research and found the following three problems during the demo test: 1. uninterrupted long polling of requests, when refreshing the page on IE, the page will get stuck. 2. The initial estimate

I. Principle: In view of the data verification of a front-end xml file, I searched for some information and summarized myself. I wrote a simple xml string verification function, the implementation process is mainly to parse the xml string by using

Using JS to write and export Word, there are many source code on the Internet, but there are many shortcomings, it only supports the IE kernel browser. You need to adjust the security level of the IE region to the lowest level, and you can only

File Upload is very common and there are some methods, but I have seen most of them based on flash, and XMLhttpResponse is also used to submit files. In fact, this is not so troublesome, here I will introduce a more compatible usage, using iframe to

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IE: window. event object exists. FF: No window. event object. You can pass the event object to the function parameters. For example: & lt; inputtype & quot; button & quot; onmousemove & quot; showDiv (event); & quot; // the event does not need to be

Main Content: addEventListener binding method problem: document. body. addEventListener (& amp; #39; click & amp; #39;, function () {alert (& amp; #39; bodyclicked & amp; #39 ;);}, false); and the second parameter is the advantages of object: d Main

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1. preface this article is based on some online materials and re-compiled, mainly as a small accumulation of your own use. The original purpose was to enable the webpage to jump automatically within the specified period of time, requests outside of

External js file test. js Code: [javascript] document. write (& quot; welcome to this page & quot;); document. write (& quot; welcome to this page & quot;); introduce external files: [javascript] & lt; head & gt; & lt; scriptsrc & quot; test. js &

[Javascript] 1. varf1function (i1, i2) {returni1 + i2 ;}; // defines an anonymous function f12.alert (f1 (5, 10); [javascript] 1. alert (function (i1, i2) {returni1 + i2;} (); // declare an anonymous function directly and use the excerpt from Click [

Read the excerpt from the JavaScript authoritative guide (Rhino) 9.7 to determine the object type. 1. typeof supports obtaining basic types, such as boolean, string, number, function, object, and undefined. Usage: varvtrue; // & quot; string & quot;,

Basic Javascript: 1. Data Type and value 1. javascript: three basic types of data are allowed: Numbers, strings, and boolean values. In addition, two types of small data are supported: null and undefine ). 2. javascript: it also supports data

First, let's talk about the eval usage. The content is relatively simple and can be skipped if you are familiar with it. The eval function receives a parameter s. If s is not a string, s is directly returned. Otherwise, execute the s statement. If

FunctionbanBackSpace (e) {vareve | window. event; // get eventobject varobjev.tar get | ev. srcElement; // obtain the event source vartobj. type | obj. getAttribute (& amp; #39; type & amp; #39;); // get... function banBackSpace (e ){ Var ev = e |

// The window pops up automatically when you click "add". After entering the information, click "OK" to automatically add the information to the table: & lt ;! DOCTYPEhtmlPUBLIC & quot;-// W3C // DTDXHTML1.0Transitional // EN & quot;

I wrote about the class implementation earlier, and then let's look at the implementation of the static class. This is frequently used in Javascript, because there are not many pages based on the same class object for current webpages, the

1. braces {} indicate defining an object. In most cases, there must be a pair of attributes and values or functions. For example: varLangShen {& quot; Name & quot;: & quot; Langshen & quot;, & quot; AGE & quot;: & quot; 28 & quot ;}; the above

Javascript defines four types of loops: for, while, do-while, and for-in. The performance of the first three cycles is not much different, but the for-in loop performance is very poor. During each loop execution, it needs to traverse all the