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<form enctype="multipart/form-data"> <input name="file" type="file" /> <input type="button" value="Upload" /> </form> <progress></progress>

首先，你可以做一些验证，例如文件的onChange事件：

 

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$(':file').change(function(){     var file = this.files[0];     name = file.name;     size = file.size;     type = file.type;     //your validation });

按钮点击触发Ajax:

 

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$(':button').click(function(){     var formData = new FormData($('form')[0]);     $.ajax({         url: 'upload.php',  //server script to process data         type: 'POST',         xhr: function() {  // custom xhr             myXhr = $.ajaxSettings.xhr();             if(myXhr.upload){ // check if upload property exists                 myXhr.upload.addEventListener('progress',progressHandlingFunction, false); // for handling the progress of the upload             }             return myXhr;         },         //Ajax事件         beforeSend: beforeSendHandler,         success: completeHandler,         error: errorHandler,         // Form数据         data: formData,         //Options to tell JQuery not to process data or worry about content-type         cache: false,         contentType: false,         processData: false     }); });

处理进度：

 

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function progressHandlingFunction(e){     if(e.lengthComputable){         $('progress').attr({value:e.loaded,max:e.total});     } }