don t know js

Confusions 1: Let's take a look at an example: function test(){message = "hi";}test();alert(message);The output string "hi" In a function, the variable defined by var is a local variable, and the variable omitted by the var operator is a global variable. Confusions 2: alert(undefined == null)The result is "true" We know that js contains basic types and reference types, including number, string, boolean,

A strange 404 question. I don't know if there is a server problem. I wrote a plug-in for fckeditor2.X and put it online for testing. Http://gufa.xp3.biz before there is no advertising, now mandatory to add advertising, resulting in failure to run normally. If you have cows installed on your computer, you can use them normally. Http://fck.hazy.allalla.com this space without advertising, but here can not run

Asp.net Ajax and jquery used blug together. I don't know who it is?Currently, all projects are asynchronously requested using Asp.net Ajax, and then the business logic is operated on WebServices, And the return value isThen, use jquery to process the returned value and the new page. Yesterday, I made a message and click Submit because it is asynchronous. There are no specific errors, that is, no results.Why is the insert in my WebServices not execut

Questions about forms don't know where to go wrong I'm going crazy. The problem is: the form is submitted directly with the Submit key area, completely no problem (the practice is to think of a table one-way different page action) but changed to a button with JS implementation of the problem, can go to the page, but the result is, the database, no response, modify the insertion can not be realized! But I ha

Today's Summary: today is better than yesterday, but it is still insufficient. Get up at 9 o ' clock in the morning (because it's too cold to climb up) and learn to stay up until 11 o'clock. Completed the task which was not completed yesterday, but today's task has not started at all. This has taught me a truth: Today is the day of completion. Yesterday's things to stay today, today's things can not be finished. Alas. My biggest problem now is to sleep late and get up late. I'm not going to get

to bottom,Download and rendering are done at the same time.2.When rendering to a portion of a page,All the above sections have been downloaded and completed(not that all associated elements have been downloaded);3.If you encounter semantic explanatory tags embedded in the file(JS script, CSS style),Then the download process of the browser will enable a separate connection to download;4.After the download, the script and style are parsed,The download

Some of the less common but powerful JavaScript tips, novice and veteran JS developers are not necessarily know. 1, truncated array and the length of the array Copy Code code as follows: var arr1 = arr2 = [1, 2, 3]; Change arr1 ARR1 = []; ARR2 is still [1,2,3] You will find that arr1 use [] method to empty the value that does not affect ARR2, if want to let arr1 change after arr2 a

a disabled or frozen state;550Requested Mail action not taken:too much recipientthe number of mass exceeds the limit;552Illegal AttachmentSending attachments of this type is not allowed, including the. uu. pif. scr. Mim. hqx. BHX NaNd. vbs. bat. com. vbe.vb. js. WSHattachments at the end;552Requested Mail action aborted:exceeded mailsize limitthe size of the letter sent exceeds the maximum limit that the NetEase mailbox is allowed to receive;553Reque

1: //定义shoPrice函数，处理返回来的data数据 function showPrice(data) { alert("Symbol: " + data.symbol + ", Price: " + data.price); }The code is as follows:Include Showprice functions and parameters in a Web pagescript type="Text/javascript"> function showprice(data) { alert ("Symbol:" + Data.symbol + ", P Rice: " + Data.price);}script> script type="Text/javascript">Showprice ({symbol: ' IBM ', Price: 91.42});script>　　 This example shows how to call a JavaScript function with static JSON data as a param

Questions about forms don't know where to go wrong I'm going crazy. The problem is: the form is submitted directly with the Submit key area, completely no problem (the practice is to think of a table one-way different page action) but changed to a button with JS implementation of the problem, can go to the page, but the result is, the database, no response, modify the insertion can not be realized! But I ha

();} else { y ();}Actually, it's the function self-tuning.function X () {Console.log (' x ')};function y () {console.log (' y ')};let z = 3; (z==3?x:y) ();9. How to gracefully represent a large numberIn JavaScript, there's a shorthand for a number, and maybe you're ignoring it. 1e7represents 10000000.Before simplifying: 10000 ; i++) {Le7 ..... ..... ..... ........................... ..... ..... ..... ..... .............. ........... (Naughty AH) 1e7 ; i++) {What do you mean, four-odd kinky t

and completed(not that all associated elements have been downloaded);3.If you encounter semantic explanatory tags embedded in the file(JS script, CSS style),Then the download process of the browser will enable a separate connection to download;4.After the download, the script and style are parsed,The download of elements that are paused after parsing;5.After the download is complete, the style sheetParses all the style sheets that were downloaded bef

, just use Html+css+js.So why do we have to write the JS framework? I think the reason is probably inertia, which is a habit. But it does not, it is not like the framework is active harm, right? Well, let's take a look at the web framework to define what I'm talking about. This is actually a gradient code that starts with a small piece of code, like the main thrust of the code, followed by a large section of code summarization, then up to the library,

why do we have to write the JS framework? I think the reason is probably inertia, which is a habit. But it does not, it is not like the framework is active harm, right? Well, let's take a look at the web framework to define what I'm talking about. This is actually a gradient code that starts with a small piece of code, like the main thrust of the code, followed by a large section of code summarization, then up to the library, and finally the framewor

informationWindow.onload=function () {var para=document.createelement (' P ');var Testdiv1=document.getelementbyid (' Testdiv1 ');Testdiv1.appendchild (para)var text=document.createtextnode (' New Node:hello world! ')Para.appendchild (text)};AppendChild can also be used for nodes that are not yet connected as part of the document tree, as followsWindow.onload=function () {var para=document.createelement (' P ');var text=document.createtextnode (' New Node:hello world11! ');Para.appendchild (tex

Even someone asked me "There are 5 text boxes on the page, each text box can only enter one character, how to use JS to implement the user input the first text box after the focus of automatic jump to the second." ”。 I said this function is not the tab to do it? Once the user has entered, you can click the TAB key, and the user can also control whether to switch to the next (because the user also has the possibility of input errors). But he insist

I often hear customers ask this question: Can you help me see how my website is opened so slowly? Is it poisoned? Then we went to test his website and found that the problem was simple: Each web page started with countless external files. The style sheet is good, with a maximum of dozens of K. The terrible thing is the JS file. The owners of these companies are not IT professionals. They manage their websites part-time. They like to cater to the speci

I often hear customers ask this question: Can you help me see how my website is opened so slowly? Is it poisoned? Then we went to test his website and found that the problem was simple: Each web page started with countless external files. The style sheet is good, with a maximum of dozens of K. The terrible thing is the JS file. The owners of these companies are not IT professionals. They manage their websites part-time. They like to cater to the spe

this implementation is not clear, welcome to see my previous days of the blog post (talk about the scope of JS and closure closure scope and closure), here you just need to know, this refers to the function of this understanding is wrong on the line.This side will be asked again, since this is not a reference function, then I want to implement a recursive function, how to reference it? Here's a quick answe

This article mainly introduces the definition of node. js, as well as a summary of the role of node. js, I hope you learn more, let's come and see this article First, let's look at what node. js can do. This is node's more formal introduction. node. JS is a JAVASCRIPT runtime environment based on the Chrome V8 engine.