google-chrome-devtools | 易学教程

Scrolling down in Chrome dev tools when paused in debugger

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问题 Is there any way to scroll down on the page while Chrome is paused in debugger mode without unpausing? 回答1: If your tools are docked, you can undock it to see a bit more. Another method: Go to the Elements tab. Right-click on any visible element (i.e. not hidden, display:none , etc.). Choose the "Scroll Into View" context menu entry. Chrome will scroll the page if necessary to get the element in the visible portion of the window. 回答2: Taken from here. An easy workaround for the scrolling lock

In the dev tools timeline, what are the empty green rectangles?

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问题 In the Chrome dev tools timeline, what is the difference between the filled, green rectangles (which represent paint operations) and the empty, green rectangles (which apparently also represent something about paint operations...)? 回答1: Painting is really two tasks: draw calls and rasterization. Draw calls . This is a list of things you'd like to draw, and its derived from the CSS applied to your elements. Ultimately there is a list of draw calls not dissimilar to the Canvas element's: moveTo

What is “initiator other” in network in chrome console?

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I fire an image tag when someone converts on our website for reporting and analytics: <img src="https://example.evyy.net/conv/?somechannel=cats&cid=3790&oid=123&cat1=premium&sku1=123&qty1=1&amt1=456&custid=qbc" /> We noticed traffic decline yesterday. To debug I visited the site and signed up, with the console open network tab. I typed "evyy" into the filter box and I see 3 line items for my tag. What does this mean? Should there not be just 1 line item? One item has a 302 status and the other two a status of 200. That's good right? Screen attached. Does this look "right"? Is there any drill

Is it safe to run multiple instances of Puppeteer at the same time?

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Is it safe/supported to run multiple instances of Puppeteer at the same time, either at the process level (multiple node screenshot.js at the same time) or at the script level (multiple puppeteer.launch() at the same time)? What are the recommended settings/limits on parallel processes? (In my tests, (1) seems to work fine, but I'm wondering about the reliability of Puppeteer's interactions with the single (?) instance of Chrome. I haven't tried (2) but that seems less likely to work out.) It's fine to run multiple browser, contexts or even pages in parallel. The limits depend on your network

Track events using Chrome javascript debugger

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问题 I don't have a specific use case here, but occasionally I have been either helping out someone on SO or seen a cool javascript effect on a website and been curious about the code that drives it. However, the event that drives the code may not be immediately obvious. If I can't find the event handler then it can be really hard to find the js responsible for the effects I am interested in. Is there a quick way in the debugger to identify the events attached to an element and to drop a break

Update source file when CSS is changed through Chrome developer tools

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I'm using xampp as my local server for php projects. I'm searching for a tool to update css changes automatically which i done through chrome inspect element. What i'm doing now is, Open my project in chrome (localhost/project) Right click and Inspect element change css (lets say change color of h1 tag) copy those and past it into my style.css What i want to do is Open my project in chrome (localhost/project) Right click and Inspect element change css (lets say change color of h1 tag) auto update changes (change color of h1 tag) in style.css Is there any tool or script available to achieve

Using Chrome Console to Access Knockout ViewModel with RequireJS

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问题 How do I access the KnockOut ViewModel variables in the Chrome console now that I am using RequireJS? Before using RequireJS, I followed a namespacing pattern, hiding everything within a single global. I could access the global by typing the following into the Chrome console: window.namespaceVar. But now that I am using RequireJS, all my variables are hidden behind the require function. require(['knockout-2.2.0', 'jquery'], function (ko, jQuery) { var ViewModel = function () { var testVar =

How can I block page autorefresh in Google Chrome?

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问题 I would like to stop autorefresh page in Google Chrome, because it is a very annoying and memory consuming issue and I can't work with the developers tools. I'm trying to delete the refresh and setTimeout function from the script using Chrome's developers tools but I have no results. How can I block this annoying feature even for a while from the console? 回答1: Since <meta http-equiv="Refresh" content="300; URL=?refresh_ce"> removal using DevTools is not sufficient (it doesn't stop page from

How install crx Chrome extension via command line?

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问题 Currently, the only way to install a Chrome extension (while working in development) is to drag it from the desktop onto the browser and click "Add" on the popup window. I would prefer to make the whole process automatic. I currently build, package and sign my CRX programatically, but am stuck with the final manual step. Is this possible? I tried creating my own URL from which to install the CRX (see here: After adding ExtensionInstallSources preference with my URL to Chrome Preferences,

how to monitor the network on node.js similar to chrome/firefox developer tools?

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问题 When developing client side javascript applications, the developer network panel is invaluable for debugging network issues: How does a developer creating a NodeJS application monitor the network traffic from the nodejs application to a http/https server? For example how to debug the following network traffic? var http = require('http'); var req = http.request ... req.write ... req.send() My code is making a call to a third party https server, so I am unable to use wireshark or similar packet