1.文件上传，使用jquery.form.js插件库
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/jquery.form.js"></script>
</head>
<body>
<form >
<input type="file" name="files" />
</form>
</body>
<script type="text/javascript">
var options = {
success: function (data) {
console.log(data)
}
};
$("#form1").ajaxForm(options);
$("#file").on("change",function(){
console.log(this.files)
$("#form1").submit();
})
</script>
</html>