Why is the readyState of XMLHttpRequest always kept at 1 when I upload images through Ajax in WeChat browser?

When a PHP website is accessed using an android browser, the readyState of some XMLHttpRequest images uploaded is always at 1, and the same program is on the mobile phone (and PC) chrome and Apple mobile browsers are all normal, and only Android browsers cannot be completed... when a PHP website is accessed using an android browser, the readyState of some XMLHttpRequest images uploaded is always at 1, and the same program is on the mobile phone (and PC) the Chrome browser and the Apple mobile phone browser are all normal. The upload process cannot be completed only in the android browser, and the status of readyState is 1 (open, I checked some articles on the Internet and started to find a problem in calling ajax, saying that the browser does not have the built-in XMLHttpRequest, but its status is always 0,
In another article, the readyState state value is always 1, indicating that the onreadystatechange callback function cannot have parameters or parentheses, and the modification based on the method does not take effect.

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When a PHP website is accessed using an android browser, the readyState of some XMLHttpRequest images uploaded is always at 1, and the same program is on the mobile phone (and PC) the Chrome browser and the Apple mobile phone browser are all normal. The upload process cannot be completed only in the android browser, and the status of readyState is 1 (open, I checked some articles on the Internet and started to find a problem in calling ajax, saying that the browser does not have the built-in XMLHttpRequest, but its status is always 0,
In another article, the readyState state value is always 1, indicating that the onreadystatechange callback function cannot have parameters or parentheses, and the modification based on the method does not take effect.

Expert advice