Php + bootstrapfileinput: An error occurred while uploading images. for help!

{Code ...} an error occurred. it seems to be a syntax error. I suspect there is an error in the fileinput event at the front end. because I only return one value for testing in the background, it should be okay. I am not familiar with fileinput, help !!! Who can give me an example? thank you!

Bug: SyntaxError: JSON. parse: unexpected character at line 1 column 1 of the JSON data. $ ("# file-5 "). fileinput ({language: 'zh ', // Setting language uploadUrl: "{: U ('Profile/upload ')}", // avatar_uploadyou must set a valid URL here else you will get an error _ UPLOAD _ partner/img allowedFileExtensions: ['jpg ', 'PNG', 'GIF'], overwriteInitial: false, maxFileSize: 1000, maxFilesNum: 1, // allowedFileTypes: ['image', 'video', 'flash'], slugCallback: function (filename) {alert ("aaa"); return filename. replace ('(','_'). replace (']', '_') ;}}). on ("fileuploaded", function (e, data) {var res = data. response; if (res. state> 0) {alert ('upload successful '); alert (res. path);} else {alert ('upload failed')}); background program I have public function upload () {} method, which is php's

An error occurred. it seems to be a syntax error. I suspect there is an error in the fileinput event at the front end. because I only return one value for testing in the background, it should be okay. I am not familiar with fileinput, help !!! Who can give me an example? thank you!

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Bug: SyntaxError: JSON. parse: unexpected character at line 1 column 1 of the JSON data. $ ("# file-5 "). fileinput ({language: 'zh ', // Setting language uploadUrl: "{: U ('Profile/upload ')}", // avatar_uploadyou must set a valid URL here else you will get an error _ UPLOAD _ partner/img allowedFileExtensions: ['jpg ', 'PNG', 'GIF'], overwriteInitial: false, maxFileSize: 1000, maxFilesNum: 1, // allowedFileTypes: ['image', 'video', 'flash'], slugCallback: function (filename) {alert ("aaa"); return filename. replace ('(','_'). replace (']', '_') ;}}). on ("fileuploaded", function (e, data) {var res = data. response; if (res. state> 0) {alert ('upload successful '); alert (res. path);} else {alert ('upload failed')}); background program I have public function upload () {} method, which is php's

An error occurred. it seems to be a syntax error. I suspect there is an error in the fileinput event at the front end. because I only return one value for testing in the background, it should be okay. I am not familiar with fileinput, help !!! Who can give me an example? thank you!