說個前提：PHP設定檔中規定預設上傳檔案大小限制2M以下，如需上傳大檔案需同時更改php.ini中的upload_max_filesize和max_execution_time以及post_max_size的值。
主介面以及Ajax實現：index.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>上傳檔案</title> <script type="text/javascript"> function sub() { var obj = new XMLHttpRequest(); obj.onreadystatechange = function() { if (obj.status == 200 && obj.readyState == 4) { document.getElementById('con').innerHTML = obj.responseText; } } // 通過Ajax對象的upload屬性的onprogress事件感知當前檔案上傳狀態 obj.upload.onprogress = function(evt) { // 上傳附件大小的百分比 var per = Math.floor((evt.loaded / evt.total) * 100) + "%"; // 當上傳檔案時顯示進度條 document.getElementById('parent').style.display = 'block'; // 通過上傳百分比設定進度條樣式的寬度 document.getElementById('son').style.width = per; // 在進度條上顯示上傳的進度值 document.getElementById('son').innerHTML = per; } // 通過FormData收集零散的檔案上傳資訊 var fm = document.getElementById('userfile3').files[0]; var fd = new FormData(); fd.append('userfile', fm); obj.open("post", "upload.php"); obj.send(fd); } </script> <style type="text/css"> #parent { width: 200px; height: 20px; border: 2px solid gray; background: lightgray; display: none; } #son { width: 0; height: 100%; background: lightgreen; text-align: center; } </style> </head> <body> <h2>Ajax實現進度條檔案上傳</h2> <p id="parent"> <p id="son"></p> </p> <p id="con"></p> <input type="file" name="userfile" id="userfile3"><br><br> <input type="button" name="btn" value="檔案上傳" onclick="sub()"> </body> </html>
php處理上傳檔案：upload.php
<?php // 上傳檔案進行簡單錯誤過濾 if ($_FILES['userfile']['error'] > 0) { exit("上傳檔案有錯".$_FILES['userfile']['error']); } // 定義存放上傳檔案的真實路徑 $path = './upload/'; // 定義存放上傳檔案的真實路徑名字 $name = $_FILES['userfile']['name']; // 將檔案的名字的字元編碼從UTF-8轉成GB2312 $name = iconv("UTF-8", "GB2312", $name); // 將上傳檔案移動到指定目錄檔案中 if (move_uploaded_file($_FILES['userfile']['tmp_name'], $path.$name)) { echo "檔案上傳成功"; } else { echo "檔案上傳失敗"; } ?>Start building with 50+ products and up to 12 months usage for Elastic Compute Service
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