10 Chrome Development Tools and Tips You Must Know

1. Simulate slow network and slow devices

We may be used to the Internet speed in cities, which is a leverage, does not mean that the Internet speed in China They are all the same. In some remote places, the network speed is still pitifully slow, so sometimes the products we make need to consider the slow network speed. So how to simulate it?

Open the performance tab of Google browser, and then click the gear icon in the upper right corner to see the Newwork and CPU simulate situations.

2. Color selector

Click the small square representing the color to pop up the color selector.

Once the color picker is enabled, you can hover over the web page and use the color picker to get the color of that pixel.

The small square that pops up the color picker also has the shortcut key Press and hold Shift and click to change the color Format.

3. Audits

Audits (audit), this function has always existed, but after chrome 60, earth-shaking changes have taken place: the introduction of Google open source Another project: LightHouse.

AuditsMainly rate the webpage from 5 aspects, and finally generate a report:

4.Pretty Print (display readable code)

We know that many websites compress Javascript code, but this is very difficult to read for developers and learners. Google provides us with a function to better view the compression. document.

We click on the curly brackets｛｝ icon below to use the Pretty Print function

5. Quick file switcher

If you know the file name, you don't have to open the "Sources" tab. Just press cmd/ctrl p, then enter the file name you want to find, then press Enter and it will be ok.

6. Responsive Mode

We develop websites on both desktop and mobile devices, and generally we prefer the initial desktop experience. But this is separate from the trend of more and more users using mobile devices to access the Internet. In order to improve the user experience of the website, we need to know exactly how the website performs on mobile devices. Chrome The mobile simulator feature has been added to the developer toolkit to help us test:

For most people, most of the time just Just view their website through different screen sizes and orientations.

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7. Screenshot

1. F12

2. [ctrl shift p]

3. Enter “capture ”

4. Select any of the following

1. capture full size screenshot”【Entire webpage】
2. capture node screenshot"【Node webpage】
3. "capture screenshot" [Current screen]

8. Extensions

We can install extensions to the Chrome developer console. Many frameworks have their own extensions to simplify development for their technologies (Vue, Angular, React, etc.). This is a list of Featured DevTools extensions.

9. Coverage

Coverage is a new feature of chrome developer tools. From the literal meaning, it can be used to detect which js and css are already present when the code is running on the website. It is running, and which js and css have not been used yet. As shown in the picture, this is the running and not yet running code displayed when I open the csdn web page.

How to open caver Prerequisite: The version of chrome browser must be 59 or above. Quickly open devtools in ctrl shift i, click on the upper right corner... More tools There is Coverage.

So what does this new feature do?

As shown in the picture above, the rightmost shows the number of css and js files we loaded. The red area indicates the code that has been run, while the cyan indicates the code that has been loaded but not run. It can be used to discover js and css codes that have not been used in the page. You can provide users with only the necessary code, thus improving the performance of the page. This is useful for identifying scripts that can be split and for lazily loading non-critical scripts.

10. Follow up on new features in real time

Chrome's development tools will be constantly updated, and it will release updated videos on What's New In DevTools. We can go and see it from time to time to learn more about it. New features, so that we can know some of Google’s useful features in real time.

Original address: https://medium.com/better-programming/10-must-know-chrome-developer-tools-and-tricks-d03f75d10cc9

Author: FelDev

For more programming-related knowledge, please visit: Introduction to Programming! !

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