google-chrome-devtools

问题 So I was successfully monitoring the performance of my React Native App in the Timings section inside the Performance Tab of Chrome Developer Tools . All of a sudden upon a particular reload of the app, the Timings tab went missing . I have tried resetting chrome, restarting my computer and changing a bunch of options inside developer tools but nothing seems to work. Could someone explain what has happened and how I can fix this? Any help would be much appreciated. Thanks! 回答1: So a user on

问题 I have an Android app with a WebView which shows a simple web page. If I run the app in Android Studio's AVD (virtual device), I can inspect the WebView in Chrome Inspector. However, if I run the app on my device, I can't see the WebView. I can see Facebook (com.facebook.katana) and I can see all my Chrome tabs, but the WebView is missing. In the past, I have been able to see the WebView on my device as well but this stopped working a few weeks ago. (Developer tools are active and USB

问题 I have an Android app with a WebView which shows a simple web page. If I run the app in Android Studio's AVD (virtual device), I can inspect the WebView in Chrome Inspector. However, if I run the app on my device, I can't see the WebView. I can see Facebook (com.facebook.katana) and I can see all my Chrome tabs, but the WebView is missing. In the past, I have been able to see the WebView on my device as well but this stopped working a few weeks ago. (Developer tools are active and USB

问题 On the Performance tab in Chrome DevTools, the Summary panel shows the timings for several categories of activities - Loading, Scripting, Rendering, Painting, System, Idle. I can't seem to find a concise description in the DevTools documentation for what each of these categories represent. I feel like I have to be overlooking something obvious. I found this SO post that describes the difference between Rendering and Painting. The Loading category is still pretty fuzzy in my mind. It doesn't

问题 So I'm building a site and want it to be responsive and mobile compatible. I've been using Chrome DevTools to view the site by different models of devices and it seems to be fine. Anyway, went to test it using localtunnel on my phone and the background image is in a different position than the view on DevTools. Is DevTools always 100% accurate? Or is this somehow relevant to localtunnel, or something entirely different? Tried looking online, couldn't find anything about DevTools being

问题 So I'm building a site and want it to be responsive and mobile compatible. I've been using Chrome DevTools to view the site by different models of devices and it seems to be fine. Anyway, went to test it using localtunnel on my phone and the background image is in a different position than the view on DevTools. Is DevTools always 100% accurate? Or is this somehow relevant to localtunnel, or something entirely different? Tried looking online, couldn't find anything about DevTools being

问题 I'm trying to debug a JavaScript onFocus event attached to a bunch of text boxes on a page. The bug occurs when selecting a text box and then tabbing to the next text box. I'm trying to debug this by placing a break point in the onFocus event using the Chrome Developer Tools. The problem I'm facing is that when I select a text box and the break point is caught, Chrome Developer Tools steals focus and does not return it, so I can't tab to the next text box. Anyone have an idea for a work

问题 I'm trying to debug a JavaScript onFocus event attached to a bunch of text boxes on a page. The bug occurs when selecting a text box and then tabbing to the next text box. I'm trying to debug this by placing a break point in the onFocus event using the Chrome Developer Tools. The problem I'm facing is that when I select a text box and the break point is caught, Chrome Developer Tools steals focus and does not return it, so I can't tab to the next text box. Anyone have an idea for a work

问题 I have installed React Developer Tools Chrome browser extension. But i cannot see the React tab in developer tools instead there are new tabs named "Components" & "Profiler". I re-installed the extension, restarted the browser and computer, checked "Allow access to file URLs" under chrome://extensions/ . I navigated to a url with react https://reactjs.org/tutorial/tutorial.html & yet react tab doesn't appear. However the chrome plugin (react detector in top right of the browser) indicates

问题 Consider the following JSX with an intentionally added duplicate key: <table> <tbody> <tr key="row1"> <td>row1_col1</td> </tr> <tr key="row1"> <--- same key here <td>row2_col1</td> </tr> </tbody> </table> As expected this leads to index.js:1 Warning: Encountered two children with the same key, row1 . Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change