关于表单 AJAX 提交方式；

<form method="post" id="upfrm" action="UPDATE_ACTION">

<input id="oldPwd" type="text" />

<input id="newPwd" type="text" />

<input type="button" value="提交"  onclick="update();"/>

</form>

.js--------------------------------------

function update(){

var options = {
 dataType: 'json',
iframe: false,
success: function(data) {
if(data.success){
alert("修改成功！");
}else{
alert(data.errors.errmsg);
}
}
};
$.ajaxSetup({contentType:'application/x-www-form-urlencoded;charset=utf-8'});
$('#upfrm').ajaxSubmit(options);

}