Why is WeChat browser uploading images via Ajax, XMLHttpRequest's readystate always stay at 1?

PHP Web site on the Android phone browser access, upload pictures of the part of the XMLHttpRequest readystate always remain at 1, the same program in the mobile phone (and PC side) Chrome browser and Apple phone browser are all normal, Only Andro browser can not complete the upload process, the card in this readystate 1 (open) status, went online to check some articles, began to find an article in the call Ajax problems, said the browser does not have built-in XMLHttpRequest, But his state was always 0,
Another article readystate that the state value is always 1, saying that the onreadystatechange callback function cannot have parameters, and that the parentheses cannot have any, and that it is not valid as modified by its method.

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PHP Web site on the Android phone browser access, upload pictures of the part of the XMLHttpRequest readystate always remain at 1, the same program in the mobile phone (and PC side) Chrome browser and Apple phone browser are all normal, Only Andro browser can not complete the upload process, the card in this readystate 1 (open) status, went online to check some articles, began to find an article in the call Ajax problems, said the browser does not have built-in XMLHttpRequest, But his state was always 0,
Another article readystate that the state value is always 1, saying that the onreadystatechange callback function cannot have parameters, and that the parentheses cannot have any, and that it is not valid as modified by its method.

Seek expert guidance

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