settimeout | 易学教程

Using Javascript to Open a New Page and Populate Form Values There

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问题 I am using JavaScript in a bookmarklet to populate form elements on a website: javascript:var f = document.forms[0]; f.getElementsByTagName('input')[0].value = 'myname'; f.getElementsByTagName('input')[1].value = 'mypassword'; f.getElementsByTagName('input')[2].click This works. However what I would like to create is a bookmarklet so that it opens the target page, and populates the values there; however it seems that onces the page is loaded, other JavaScript codes are not executed. So, the

Why does the Promise object block rendering?

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问题 I was testing the Promise object and wrote some code that simulates a long running task that is synchronous. I was comparing Promise and setTimeout - see fiddle: <!DOCTYPE html> <html> <head> <link rel="stylesheet" href="style.css"> </head> <body> <h2>Promise vs setTimeout</h2> <div><button id="settimeout-test">setTimeout with slow running function</button></div> <div><button id="promise-test">Promise and slow running function</button></div> <div><button id="clear">Clear Results</button></div

setTimeout runs only once?

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问题 function slide() { if($('.current').is(':last-child')){ $('.current').removeClass('.current'); $('#imgholder').first().addClass('.current'); $('#imgholder').animate({left: '3920px'}); } else{ $nxt=$(".current"); $(".current").removeClass("current"); $nxt.next().addClass("current"); $('#imgholder').animate({left: '-=980'},{duration: 'slow', easing: 'easeOutBounce' }); } } var loop_handle= setTimeout("slide()",'3000'); I have put this code in header section and the setTimeout runs only once.

Add delay to javascript method that returns promise

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问题 I'm currently trying to learn Angular 2, typescript, promises, etc. I've setup a small app for developer tools and a service that just returns hard-coded data. This is to be used for testing purposes only. I'd like to add short timeout on the service method to simulate server lag for testing some of my controls, but I can't find the correct syntax to do so. How can I add a 5 second delay to my service call? Developer Tools Service @Injectable() export class DeveloperService { getExampleData()

setTimeout inside for loop [duplicate]

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问题 This question already has answers here : setTimeout in for-loop does not print consecutive values [duplicate] (10 answers) Closed 4 years ago . I want a string to appear character-for-character with the following code: function initText() { var textScroller = document.getElementById('textScroller'); var text = 'Hello how are you?'; for(c = 0; c < text.length; c++) { setTimeout('textScroller.innerHTML += text[c]', 1000); } } window.onload = initText; It's not working.. what am I doing wrong?

Is there a function similar to setTimeout() (JavaScript) for PHP?

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问题 The question sort of says it all - is there a function which does the same as the JavaScript function setTimeout() for PHP ? I've searched php.net , and I can't seem to find any... 回答1: There is no way to delay execution of part of the code of in the current script. It wouldn't make much sense, either, as the processing of a PHP script takes place entirely on server side and you would just delay the overall execution of the script. There is sleep() but that will simply halt the process for a

difference between setTimeout in javascript and $timeout service in angularjs

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问题 Iam new to angular framework.Here is my scenario where, I want to change my $scope.variable after a period of time so i used javascript setTimeout method. $scope.variable = 'Previous'; setTimeout(function(){ $scope.variable='NEXT'; },3000); This code doesn't work for me. I used $apply() to make this code work. Later I came to know that angular itself has a $timeout service which does the same work. $scope.variable = 'Previous'; $timeout(function () { $scope.variable = 'NEXT'; }, 2000); How

how many javascript setTimeout/ setInterval call can be set simultaneously in one page?

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问题 I have to use atleast 2 setTimeouts and 1 setInterval. Does this have any dependency on the browser or javascript engine being used? 回答1: On a page you can have as many setTimeouts/setIntervals running at once as you wish, however in order to control each individually you will need to assign them to a variable. var interval_1 = setInterval("callFunc1();",2000); var interval_2 = setInterval("callFunc2();",1000); clearInterval(interval_1); The same code above applies to setTimeout, simply

How is setTimeout implemented in node.js

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问题 I was wondering if anybody knows how setTimeout is implemented in node.js. I believe I have read somewhere that this is not part of V8. I quickly tried to find the implementation, but could not find it in the source(BIG).I for example found this timers.js file, which then for example links to timer_wrap.cc. But these file do not completely answer all of my questions. Does V8 have setTimeout implementation? I guess also from the source the answer is no. How is setTimeout implemented?

How is setTimeout implemented in node.js

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