jQuery 利用$.ajax 时获取原生XMLHttpRequest 对象的方法

<script> $('.screenshot_input').change(function (){ //获取file对象 即相当于可以直接post的$_FILES数据 var domFile = $(this)[0].files[0] var domForm = $('#testForm')[0] //将form对象直接作为参数 new FormData对象 var formData = new FormData(domForm); //追加file 对象 formData.append('file',domFile); $.ajax({ url:'{{ path( 'acme_admin_app_dealAppScreenShot') }}', type: "POST", data: formData, processData: false, // tell jQuery not to process the data contentType: false, // tell jQuery not to set contentType xhr: function(){ //这是关键 获取原生的xhr对象 做以前做的所有事情 var xhr = jQuery.ajaxSettings.xhr(); xhr.upload.onload = function (){ alert('finish downloading') } xhr.upload.onprogress = function (ev) { if(ev.lengthComputable) { var percent = 100 * ev.loaded/ev.total; console.log(percent,ev) } } return xhr; }, success:function(data){ alert(data) } }) }) </script> Array ( [name] => cooff [email] => qq.comaa ) Array ( [file] => Array ( [name] => yunce2.0测试.apk [type] => application/vnd.android.package-archive [tmp_name] => /tmp/php4Jxt0c [error] => 0 [size] => 6476627 ) )