upload-at-click 介绍
这是一个 JavaScript 库用来实现点击链接、按钮或者某个元素上传文件的功能，在线演示：
http://upload-at-click.narod.ru/demo.html
示例代码：
var uploader = document.getElementById('uploader');
upclick(
{
element: uploader,
action: '/path_to/you_server_script.PHP',
onstart:
function(filename)
{
alert('Start upload: '+filename);
},
oncomplete:
function(response_data)
{
alert(response_data);
}
});