大家应该可以举出几种常用的异步文件上传功能的实现方式，使用频率较多的有原生ajax和iframe框架，实现图片文件上传，下面就为大家分享图片文件上传的两种方式：原生ajax和iframe框架，供大家参考，具体内容如下
方法一：利用iframe框架上传图片
html代码如下:
<div> <form action="upload.php" method="post" target="tarframe" enctype="multipart/form-data"> <input type="file"> </form> <iframe src=""></iframe> </div> <div> </div>
index.js文件：
$(function(){ $("#upload_file").change(function(){ $("#uploadFrom").submit(); }); }); function stopSend(str){ var im="<img src='upload/images/"+str+"'>"; $("#msg").append(im); }
upload.php文件：
<php $file=$_FILES['upfile']; $name=rand(0,500000).dechex(rand(0,10000)).".jpg"; move_uploaded_file($file['tmp_name'],"https://www.jb51.net/upload/images/".$name); //调用iframe父窗口的js 函数 echo "<script>parent.stopSend('$name')</script>"; ?>
方法二：原生态ajax文件上传
<!DOCTYPE html> <html> <head> <title>Html5 Ajax 上传文件</title> <meta charset="utf-8"> <script type="text/javascript"> var xhr; function createXMLHttpRequest() { if(window.ActiveXObject) { xhr = new ActiveXObject("Microsoft.XMLHTTP"); } else if(window.XMLHttpRequest) { xhr = new XMLHttpRequest(); } } function UpladFile() { var fileObj = document.getElementById("file").files[0]; var FileController = 'upload.php'; var form = new FormData(); form.append("myfile", fileObj); createXMLHttpRequest(); xhr.onreadystatechange = handleStateChange; xhr.open("post", FileController, true); xhr.send(form); } function handleStateChange() { if(xhr.readyState == 4) { if (xhr.status == 200 || xhr.status == 0) { var result = xhr.responseText; var json = eval("(" + result + ")"); alert('图片链接:n'+json.file); } } } </script> <style> .txt{ height:28px; border:1px solid #cdcdcd; width:670px;} .mybtn{ background-color:#FFF; line-height:14px;vertical-align:middle;border:1px solid #CDCDCD;height:30px; width:70px;} .file{ position:absolute; top:0; right:80px; height:24px; filter:alpha(opacity:0);opacity: 0;width:260px } </style> </head> <body> <div> <label>图片</label> <br/> <input type='text' /> <span>浏览...</span> <input type="file" size="28" onchange="document.getElementById('textfield').value=this.value" /> <span>上传</span> </div> </body> </html>
php代码：
<?php if(isset($_FILES["myfile"])) { $ret = array(); $uploadDir = 'images'.DIRECTORY_SEPARATOR.date("Ymd").DIRECTORY_SEPARATOR; $dir = dirname(__FILE__).DIRECTORY_SEPARATOR.$uploadDir; file_exists($dir) || (mkdir($dir,0777,true) && chmod($dir,0777)); if(!is_array($_FILES["myfile"]["name"])) //single file { $fileName = time().uniqid().'.'.pathinfo($_FILES["myfile"]["name"])['extension']; move_uploaded_file($_FILES["myfile"]["tmp_name"],$dir.$fileName); $ret['file'] = DIRECTORY_SEPARATOR.$uploadDir.$fileName; } echo json_encode($ret); } ?>