html结构
<div class="camera-area">
 <form enctype="multipart/form-data" method="post">
 <input type="file" name="fileToUpload" class="fileToUpload" accept="image/*" capture="camera"/>
  <div class="upload-progress"><span></span></div>
 </form>
 <div class="thumb"></div>
 </div>
封装的upload类,依赖zepto
(function($) {
 $.extend($.fn, {
 fileUpload: function(opts) {
 this.each(function() {
 var $self = $(this);
 var doms = {
  "fileToUpload": $self.find(".fileToUpload"),
  "thumb": $self.find(".thumb"),
  "progress": $self.find(".upload-progress")
 };
 var funs = {
  //选择文件,获取文件大小,也可以在这里获取文件格式,限制用户上传非要求格式的文件
  "fileSelected": function() {
  var files = (doms.fileToUpload)[0].files;
  var count = files.length;
  for (var index = 0; index < count; index++) {
  var file = files[index];
  var fileSize = 0;
  if (file.size > 1024 * 1024)
  fileSize = (Math.round(file.size * 100 / (1024 * 1024)) / 100).toString() + 'MB';
  else
  fileSize = (Math.round(file.size * 100 / 1024) / 100).toString() + 'KB';
  }
  funs.uploadFile();
  },
  //异步上传文件
  uploadFile: function() {
  var fd = new FormData();//创建表单数据对象
  var files = (doms.fileToUpload)[0].files;
  var count = files.length;
  for (var index = 0; index < count; index++) {
  var file = files[index];
  fd.append(opts.file, file);//将文件添加到表单数据中
  funs.previewImage(file);//上传前预览图片,也可以通过其他方法预览txt
  }
  var xhr = new XMLHttpRequest();
  xhr.upload.addEventListener("progress", funs.uploadProgress, false);//监听上传进度
  xhr.addEventListener("load", funs.uploadComplete, false);
  xhr.addEventListener("error", opts.uploadFailed, false);
  xhr.open("POST", opts.url);
  xhr.send(fd);
  },
  //文件预览
  previewImage: function(file) {
  var gallery = doms.thumb;
  var img = document.createElement("img");
  img.file = file;
  doms.thumb.html(img);
  // 使用FileReader方法显示图片内容
  var reader = new FileReader();
  reader.onload = (function(aImg) {
  return function(e) {
  aImg.src = e.target.result;
  };
  })(img);
  reader.readAsDataURL(file);
  },
  uploadProgress: function(evt) {
  if (evt.lengthComputable) {
  var percentComplete = Math.round(evt.loaded * 100 / evt.total);
  doms.progress.html(percentComplete.toString() + '%');
  }
  },
  "uploadComplete": function(evt) {
  alert(evt.target.responseText)
  }
 };
 doms.fileToUpload.on("change", function() {
  doms.progress.find("span").width("0");
  funs.fileSelected();
 });
 });
 }
 });
})(Zepto);
调用方法
$(".camera-area").fileUpload({
 "url": "savetofile.php",
 "file": "myFile"
 });
后端处理(php)
<?php
if (isset($_FILES['myFile'])) {
 // Example:
 writeLog($_FILES);
 move_uploaded_file($_FILES['myFile']['tmp_name'], "uploads/" . $_FILES['myFile']['name']);
 echo 'successful';
}
function writeLog($log){
 if(is_array($log) || is_object($log)){
 $log = json_encode($log);
 }
 $log = $log."\r\n";
 
 file_put_contents('log.log', $log,FILE_APPEND);
}
?>
后端处理php(thinkphp)
public function upload_images_select(){
        header('Content-type: application/json'); //json
        $upload = new \Think\Upload();// 实例化上传类    
        $upload->rootPath = C('rootPath');
        $upload->maxSize   =     3145728 ;// 设置附件上传大小    
        $upload->exts      =     array('jpg', 'gif', 'png', 'jpeg');// 设置附件上传类型    
        $upload->savePath  =      './images/Member/Evaluate/'; // 设置附件上传目录    // 上传文件     
        $info   =   $upload->upload();    
        if(!$info) {
        // 上传错误提示错误信息        
            $this->error($upload->getError());    
        }else{
            // 上传成功  
            $this->ajaxReturn(array('status'=>1,'item'=>$info));   
        }
    }
注:thinkphp 多图片上传出现的bug详见上一篇文章