What should I do if the javascript image does not display?

Javascript is a scripting language commonly used in Web development. It can achieve dynamic interactive effects, including addition, deletion, modification and query of page elements, form verification, data processing and other functions. Among them, the display of pictures is also an important function in Javascript. However, sometimes we encounter a situation where the image does not display, and at this time we need to perform some inspections and debugging to solve the problem.

The following are some reasons that may cause the image not to be displayed and the corresponding solutions:

1. Picture path error

First, we need to check the image Is the path correct? In web development, there are two forms of image paths: relative paths and absolute paths. If it is a relative path, you need to pay attention to whether the path is correct. For example, whether the folder where the picture is located is in the same directory as the page that references it. If it is an absolute path, you need to check whether the path is complete and correct.

Solution:

You can directly access the image path in the browser to see if it can be opened normally. If it cannot be opened, the image path is wrong and the path needs to be modified.

2. The picture name has wrong capitalization

Sometimes, the wrong case of the picture name will also cause the picture to not be displayed. Under Windows operating systems, file names are not case-sensitive, but under Unix/Linux systems, file names are case-sensitive. If the case of the image name referenced in the code is inconsistent with the actual file name, the image will not be displayed correctly.

Solution:

Check whether the image file name is consistent with the one in the code. If you find a case inconsistency problem, you need to change the image name in the code to the same case as the actual file name.

3. Caching problem

When we modify the image, sometimes we still cannot see the modified effect. This is due to browser cache. The browser will cache the images that have been loaded. The next time you access the same image, you can read it directly from the cache to speed up page rendering. However, if we modify the image, the image in the cache has not been updated and is still the old image, so the new image cannot be displayed.

Solution:

You can clear the cache in the browser, then load the page again to see if the image displays normally. In the Chrome browser, you can use the shortcut key "Ctrl Shift Delete" to enter the clear cache page, select the content that needs to be cleared, and then click the "Clear Data" button.

4. Image format is not supported

In web development, our commonly used image formats include JPEG, PNG, GIF, etc. If we use an unsupported image format, the image cannot be displayed.

Solution:

Use standard image formats, such as JPEG, PNG, GIF, etc.

5. javascript code error

Finally, if the image still cannot be displayed, the problem may lie in the javascript code. It may be caused by code logic errors, grammatical errors and other issues.

Solution:

Check the javascript code and debug it to troubleshoot and locate errors. You can use the debugging tools that come with the browser, such as the "Developer Tools" page in the Chrome browser, to debug.

In short, when you encounter a situation where pictures are not displayed, you need to carefully troubleshoot the problem and solve it step by step. Through the above possible causes and corresponding solutions, we can more quickly find and solve the problem of pictures not being displayed.

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