S 回调函数，传参的办法。function uploadFile(t) {        var fd = new FormData();        fd.append("_netLogo", document.getElementById('_netLogo').files[0]);        var xhr = new XMLHttpRequest();// 原来 xhr.upload.addEventListener("progress", uploadProgress, false);        xhr.upload.addEventListener("progress", function () { uploadProgress(event,t) }, false);        xhr.addEventListener("load", uploadComplete, false);        xhr.addEventListener("error", uploadFailed, false);        xhr.addEventListener("abort", uploadCanceled, false);        xhr.open("POST", "/User/WNetEdit2_test");        xhr.send(fd);    }function uploadProgress(evt, t) {        $(t).parent().find("._ProgressNum").remove();    }上面代码中为什么调动不了  uploadProgress(evt, t) 方法啊，我想把t传过去，麻烦大神解释一下，或者其他方案也行