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It is a simple ajax cross-domain value transfer, using the relative path code as follows:

    //這里我沒有做瀏覽器判斷
    var url ="../Qiniu/changeMysql.php";
        console.log(URL);
        $.ajax({
            url:url,
            type:'POST',
            data:{'randomName':randomName,'id':id},
            dataType:'JSON',
            success:function(res){}
            )};

But my file directory is like this

 vtour_background----Qiniu------------changeMysql.php
                  | 
                  ---BackgroudHTML---indextest.html(為瀏覽器運(yùn)行頁(yè)面，引用changepictures.js)
                                  |    
                                  ---scripts ----------------changepictures.js
                                  

The above code is that the relative path of the chrome browser in changepictures.js is not based on the current js? The url should be "../../Qiniu/changeMysql.php", but now I can use the above url to pass the value correctly. do not know why. Could you guys help me out or tell me how to check this error? Thank you very much~