google-chrome-devtools | 易学教程

XHR request is denoted as being cancelled although it seems to be successful [closed]

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问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 6 years ago . This is not really an issue, because the code works, but I am just curious as to why it happens. I have the following jQuery code for an ajax post: $

jQuery in Chrome Console (8.0.552.237)

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问题 It appears that jQuery selectors are not functioning in the Chrome Console. Any type of selector returns "null". The scripts do properly run the javascript, however. Has anyone else noticed this change or know of a fix. Thanks. 回答1: I uncovered the cause of this in my own question. The console injects its own function (just a shorthand) for document.getElementById() , aliased to $ , which shadows jQuery's $ . Easy way to check this: when you're at a breakpoint, and jQuery seems to be broken,

Reducing scroll jank when using overflow-y: scroll;

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问题 I have a 2 column layout, the right hand column is a scrollable result lists with a max of 200 item results (basically just a ul with overflow-y: scroll; set) What I am finding is that the right hand column is causing some jank (which is especially noticeable on low end hardware) when you scroll. In the chrome timeline i can see some major "Update Layer tree" while I scroll the column. Is there any way I can figure out why "Update Layer tree" is so lengthy and what CSS properties are

Chrome's firebug's technic to track ajax requests

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I'm trying to make my google chrome extension to track ajax requests while browsing web. Only way i found is to listen for DOMSubtreeModified event. Event is fired on every single ajax event but there is no additional information about the request. But in Firebug google chrome extension there is ajax requests tracking with many details. I tried to check how they do it in the source code but it's hard for me to understand. Do You know how to track those events to get some details about request? Maybe someone could take a look at this firebug's technic or maybe someone knows it and could tell me

Chrome Devtools Dedicated Node.js Inspector not stopping at breakpoints

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问题 There have been a couple of older posts regarding this issue, but date from questions asked in 2013 and 2014 and the answers in there have not helped my case. I have the debugger keyword placed in multiple places in my file, and have even added manual breakpoints in the inspector UI. Still, executing the file does not stop at any breakpoints. I am using node 9.2.0 and chrome 64.0.3282.167. Here is a picture of how my devtools appears. 回答1: This is a problem that has been extremely annoying to

Chrome opens with “Data;” with selenium

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I am a newbie to Selenium and trying to open localhost:3000 page from Chrome via selenium driver. The code is : import com.google.common.base.Function; import org.openqa.selenium.By; import org.openqa.selenium.WebDriver; import org.openqa.selenium.WebDriverException; import org.openqa.selenium.chrome.ChromeDriver; import org.openqa.selenium.firefox.FirefoxDriver; import org.openqa.selenium.firefox.FirefoxDriver; public class SeleniumTests { public static void main(String[] args) { System.setProperty("webdriver.chrome.driver", "C://chromedriver_win32//chromedriver.exe"); WebDriver driver = new

Show FPS meter Chrome 33

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I think I'm going mad. I use the FPS meter in Chrome all the time, but I can no longer find it. If I go into settings in the dev tools it is not there. Can anyone guide me as to what I am doing wrong? I am using a Windows PC and Chrome 33.0.1750.117 Go to about:flags and enable the the FPS counter there. You might also need to enable GPU composition on all pages. I can't enable this on my current machine, so I'm afraid I can't test it myself. See this article for more information Found the answer in the developer tools docs . They have moved to Timeline Towards the bottom there is a tab called

element.style in chrome element inspector?

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When I inspect elements in Chrome, under my styles I have element.style {} , What does this refer to? It contains styles I am not including in my code source. Those are inline styles. They come from the style="" attribute or from Javascript code that sets element.style.someProperty . 来源： https://stackoverflow.com/questions/15711300/element-style-in-chrome-element-inspector

Highlight node with chrome devtools extension [closed]

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I would like to highlight a dom element from my chrome dev-tools extension in the same way as Element inspector (in dev tools) does. Is there some special API for this? Thanks Whenever you evaluate some code in the inspected page using DevTools console, DevTools expose a bunch of helper calls known as command line API . This API includes inspect() call that has the same effect as if user invoked "Inspect Element" from the context menu, i.e. brings up the Elements panel and highlights the node. The inspect() call along with the rest of command line API is available to code evaluated by DevTools

Workaround for logging objects to console in Chrome

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If you execute this code: var foo = {bar: 'baz'}; window.console.log(foo); foo.bar = 'bla'; The console shows this after expanding the object: (when logging objects and arrays, it's not the run-time value that's recorded) This bug was documented over a year ago: http://code.google.com/p/chromium/issues/detail?id=50316 Is there a workaround for logging objects in Chrome? I just use JSON.stringify when i need it. Don't know if it will do it for you, but it is easy and effective for debugging purposes. This is no good for objects with function references in it tho, so if you need that i would