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html5上传文件api

使用XMLHttpRequest上传文件
var xhr = new XMLHttpRequest();

//监听选择文件信息

function fileSelected() {

//HTML5文件API操作

var file = document.getElementById('fileName').files[0];

if (file) {

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';

document.getElementById('fileName').innerHTML = 'Name: ' + file.name;

document.getElementById('fileSize').innerHTML = 'Size: ' + fileSize;

document.getElementById('fileType').innerHTML = 'Type: ' + file.type;

}

}

//上传文件

function uploadFile() {

var fd = new FormData();

//关联表单数据,可以是自定义参数

fd.append("name", document.getElementById('name').value);

fd.append("fileName", document.getElementById('fileName').files[0]);

//监听事件

xhr.upload.addEventListener("progress", uploadProgress, false);

xhr.addEventListener("load", uploadComplete, false);

xhr.addEventListener("error", uploadFailed, false);

xhr.addEventListener("abort", uploadCanceled, false);

//发送文件和表单自定义参数

xhr.open("POST", "/user/uploadifyTest_doUpload");

xhr.send(fd);

}

//取消上传

function cancleUploadFile(){

xhr.abort();
xhr.abort();

}

//上传进度

function uploadProgress(evt) {

if (evt.lengthComputable) {

var percentComplete = Math.round(evt.loaded * 100 / evt.total);

document.getElementById('progressNumber').innerHTML = percentComplete.toString() + '%';

}

else {

document.getElementById('progressNumber').innerHTML = 'unable to compute';

}

}

//上传成功响应

function uploadComplete(evt) {

//服务断接收完文件返回的结果

alert(evt.target.responseText);

}

//上传失败

function uploadFailed(evt) {

alert("上传失败");

}

//取消上传

function uploadCanceled(evt) {

alert("您取消了本次上传.");

}