ajax settimeout

landlord briefly plain English description. A section of JS code (which may contain some settimeout, mouse clicks, Ajax and other events), from top to bottom to execute, encountered settimeout, mouse clicks and other events, asynchronous execution of them, at this time does not affect the code body continues to execute, once the asynchronous event is executed, C

object of your own definition similar to {' Length ': 2, ' 0 ': ' Eat ', ' 1 ': ' Bananas '}. Call, apply method The difference is that, starting with the second argument, the calling method parameter is passed to the borrowed method as an argument, and apply directly places the parameters in an array and then passes the argument list of the last borrowed method. Application scenario: Call can be used when the parameter is clear, apply to arguments when the parameter is ambiguous Now let's g

simply insert code into the Code queue to implement the code's deferred execution (or asynchronous execution). But in fact the so-called asynchrony is just an illusion?? It's also running on a thread!So the question is, what if the code execution time before the code insertion point exceeds the set time of the incoming settimeout or setinterval? Let's take a look at this piece of code: The code is as follows: The code is as follows

two setTimeout Callbacks is greater than or equal to 10 ms.. After the setinterval is set for the second part, the scheduled thread will generate an asynchronous scheduled event every 10 seconds and put it at the end of the task queue. Theoretically, two setintervalCallback execution interval Case 2: Is Ajax asynchronous requests actually asynchronous? Many of my friends are confused. Since JavaScript run

see, the landlord briefly vernacular description. A section of JS code (which may contain some settimeout, mouse clicks, Ajax and other events), from top to bottom to start execution, encounter settimeout, mouse clicks and other events, asynchronous execution of them, this time will not affect the code body to continue to execute, once the asynchronous event is

will continue to generate asynchronous timed events every 10 seconds and put to the end of the task queue, theoretically two setinterval Callback execution Interval Case 2:ajax is the asynchronous request really asynchronous?Many classmates friends do not know, since said JavaScript is single-threaded run, then XMLHttpRequest after the connection is really asynchronous?The request is actually asynchronous, but the request is made by the browser to op

interval from the end of the next Callback. The theoretical interval between the two setTimeout callback executions is greater than or equal to 10 ms. in the second paragraph, after the setinterval is set to a scheduled time, the scheduled thread will continuously generate asynchronous scheduled events every 10 seconds and put them at the end of the task queue. In theory, the two setinterval callback execution intervals are Case 2: Is

) {}}, 1000 );SetTimeout (function () {alert (end 2) ;},2000 );SetTimeout (function () {alert (end1) ;}, 100 );Alert (end );The execution result is 'end' 'end 1', And the browser is suspended, that is, 'end 2' is not displayed '. That is to say, the execution in the first settimeout is an endless loop, which directly causes the function to be blocked in the secon

the end of the next Callback. The theoretical interval between the two setTimeout callback executions is greater than or equal to 10 ms. in the second paragraph, after the setinterval is set to a scheduled time, the scheduled thread will continuously generate asynchronous scheduled events every 10 seconds and put them at the end of the task queue. In theory, the two setinterval callback execution intervals are Case 2: Is

　　Recently encountered some problems in the work, is roughly about the JS implementation problem. Some strange bugs were caused by the failure to understand the order of execution. So here's some knowledge about asynchronous execution (tip of the iceberg) ...　　We all know that JS is single-threaded, execution is sequential, in the sequence of business logic of course no problem. If you encounter business logic that can be executed concurrently, then the queue is very low, so it needs to be execu

Today, check yourself with jquery+ajax+php do the website background login detection, found that after the successful landing page jump function this javascript (JS) code effects in IE and Google browser Chrome can be well executed, compatibility is not bad. Results to the Firefox (Firefox) browser settimeout This JS built-in function does not execute, invalid, also did not complain! Open Firebug hope it ca

second settimeout that is theoretically executed one second later than it, this is inconsistent with the asynchronous function multithreading that we usually understand. 2. ajax request callback Next, let's test the ajax asynchronous request calling through xmlhttprequest. The main code is as follows: Var xmlReq = createXMLHTTP (); // create an xmlhttprequest ob

until the task finishes processing, returning the engine to run the next task, and other tasks in the queue that are not returned by the task cannot be executed.I believe you are now well aware that JavaScript is multi-threaded and understand how JavaScript timer works, let's take a look at some of these cases:Case 1:settimeout and SetIntervalSetTimeout (function () {/* code block ... */setTimeout (Argumen