背景：用戶上傳圖片并點擊“保存”按鈕。我成功地將圖像保存在服務器中。我給了文件夾 777 的權(quán)限....問題：我試圖打開圖片，但顯示不正確：圖片網(wǎng)址在此處輸入圖片說明html<button class ="save" onclick="test()">Save image to server</button>腳本：function test(){var canvas  = document.getElementById("0");var dataURL = canvas.toDataURL();  // THE BASE 64 DATAvar dataFileName = document.getElementById('fileup').value.replace(/.*(\/|\\)/, ''); // GET THE FILE NAME THAT USER CHOSEvar dataFileType = dataFileName.split('.').pop();$.ajax({  type: "POST",  url: "tamaker.php",  data: {      imgBase64: dataURL,     imgFileName: dataFileName,     imgFileType: dataFileType  }}).done(function(o, imgFileName) {  console.log(o);    var response = JSON.parse(o);  console.log(response);  $('body').prepend('<img src="' + dataFileName+ '" style="height: 200px; width: auto;">');});}保存.php<?phpini_set('display_errors', 1);ini_set('display_startup_errors', 1);error_reporting(E_ALL);if( isset($_POST['imgBase64']) && isset($_POST['imgFileName']) && isset($_POST['imgFileType']) ){    $fname = filter_input(INPUT_POST, 'imgFileName'); // THE FILENAME THE USER CHOSE IS RECEIVED VIA POST    $img = filter_input(INPUT_POST, 'imgBase64');  // THE BASE64 ENCODING RECEIVED VIA POST    $imgtype = filter_input(INPUT_POST, 'imgFileType');  // THE FILE TYPE / EXTENSION IS RECEIVED VIA POST    // STRIP OFF THE BEGINNING OF THE BASE64 DATA, BUT DEPENDS ON THE IMAGE TYPE.      // I COULD HAVE SIMPLIFIED THIS BUT USED IF STATEMENTS.    if ( $imgtype === 'png'){        $img = str_replace('data:image/png;base64,', '', $img);    };    if ( $imgtype === 'jpg' || $imgtype === 'jpeg'){        $img = str_replace('data:image/jpeg;base64,', '', $img);    };    if ( $imgtype === 'gif'){        $img = str_replace('data:image/gif;base64,', '', $img);    };