ajax settimeout

Precautions for using setTimeout in js, jssettimeout SetTimeout is frequently used in js. The most common is timer. SetTimeout usage is simple var r = setTimeout (func, 1000 ); First, it uses the return value to clear setTimeout and clearTimeout (r)

Often see settimeout delay 0ms JavaScript code, feel very confused, is it not a delay of 0ms and no delay is not a reason? Later through the investigation of data and experiments to obtain the following two roles, may also have a role I do not know, hope to know that friends in the comments on the back of the generous point.1, realize the asynchronous JavaScript;JavaScript is normally executed in sequence. However, we may let the statement after the s

Delay Automatic CompletionRequirements: In the text input box, listening for user input, to achieve the function of automatic completion.Disadvantages: Each user input a character, will produce an AJAX request, if the user entered a long string of content, the number of requests are many, in fact, the last time, is the user needs.The code is similar to the example above. Deferred scrollingRequirements: page ads, users need to scroll to where to follo

SetTimeout SetTimeout () //-run the code after the specified timeClearTimeout () //-cancel setTimeout () Note: setTimeout () and clearTimeout () are both functions of the Window object of html dom. Usage: setTimeout () is used to call a function or computing expression after

This article mainly introduces parameter passing and calling of setTimeout and setInterval functions in JavaScript, two functions can insert the code to be executed into a code queue maintained by the js engine at a set time point. For more information, see How to pass parameters to setTimeout and setIntervalSee the following code: var str = 'aaa'; var num = 2; function auto(num){ alert(num); }

Use of settimeout and setintervalBoth of these methods can be used to implement JavaScript after a fixed time period. But each has its own application Scenario.MethodIn fact, settimeout and setinterval have the same syntax. They all have two parameters, one is the code string to execute, and one is the time interval in milliseconds, and the code executes after that time Period.however, the two functions are

Some days ago when I practiced writing a small example, I used a timer and found that in SetInterval and settimeout, the this in the function points to the Window object, as in the following example:varnum = 0;functionObj () { This. num = 1, This. Getnum =function() {Console.log ( This. Num); }, This. Getnumlater =function() {setTimeout (function() {Console.log ( This. Num); }, 1000) }}varobj =Ne

Both methods can be used to execute JavaScript after a fixed period of time. However, they have different application scenarios. Method In fact, setTimeout and setinterval have the same syntax. Both of them have two parameters. One is to be executed.CodeString, and a time interval in milliseconds. After that time period, the code will be executed. However, there are differences between the two functions. After the setinterval code is executed, it a

The SetInterval () method can call a function or a calculation expression in the specified period (in milliseconds). The Clearinterval () method can cancel the periodic method call. When the setinterval call completes, it returns a timer ID that can be used in the future for the timer Access, and if the ID is passed to clearinterval, the execution of the invoked process code can be terminated. JS setinterval () usage Countdown instance code is as follows copy code

Inadvertently testing Ajaxrequest browser compatibility, found that the Ajaxrequest.update method in some cases in IE have problems, after testing to find settimeout and setinterval problems. The problem is now when you call the Ajaxrequest.update method, if you have the update interval and the number of updates, then there will be problems under IE, which is the function when the update interval is taken, and the function cannot stop executing after

Recently with SetTimeout, setinterval, because the function to be passed to use this, so in-depth understanding of some!The third argument to the settimeout and setinterval functions was to simply define the language type, which was later supported in non-IE browsers and supported under different browsers.The original settimeout function definition:var Timeoutid