浏览器上传文件到PHP的几种方法

<div class="fr">
<!--上传文件方法一：--><form name="form1">        <div class="progress">            <div class="progress-bars" style="width:1%">            </div>        </div>        <span id="upload_fail" class="red gapr">上传失败，请重试</span>        <a id="a_upload_file" href="#" class="gap">添加文件</a>        <input id="input_token" type="hidden" name="<?php echo $tokenName; ?>" value="<?php echo $hash; ?>">        <input type="hidden" name="audit_type" value="<?php echo $audit_type; ?>">        <input id="input_upload_file" type="file" name="userfile">        </form>
</div>

<script>var data = <?php echo $data; ?>;var audit_type = <?php echo $audit_type; ?>;var process_id = <?php echo $process_id; ?>;$(document).ready(function() {$('#input_upload_file').hide();$('#input_submit').hide();$('.progress').hide();$('#upload_fail').hide();});$('#a_upload_file').click(function(){$('#input_upload_file').click();$('.progress-bars').width("0%");});$('#input_upload_file').change(function(){$('.progress').show();$('#upload_fail').hide();var fd = new FormData();fd.append($('#input_token').attr("name"),$('#input_token').attr("value"));fd.append("userfile",document.getElementById('input_upload_file').files[0]);var xhr = new XMLHttpRequest();xhr.upload.addEventListener("progress", uploadProgress, false);xhr.addEventListener("load", uploadComplete, false);xhr.addEventListener("error", uploadFailed, false);xhr.open("POST","http.......................");xhr.send(fd);});function uploadProgress(evt) {if (evt.lengthComputable) {var percentComplete = Math.round(evt.loaded * 100 / evt.total);$('.progress-bars').width(percentComplete+"%");}else {$('.progress-bars').width("0%");}    }function uploadComplete(evt) {alert(evt.target.responseText);$('.progress').hide();}function uploadFailed(evt) {$('#upload_fail').show();}</script>