jquery序列化提交中文乱码怎么办

//登录
$(".register-btn").click(function() {
var form = $("#register-form").serialize();
//序列化中文时之所以乱码是因为.serialize()调用了encodeURLComponent方法将数据编码了
            //原因：.serialize()自动调用了encodeURIComponent方法将数据编码了   
            //解决方法：调用decodeURIComponent(XXX,true);将数据解码    
            form = decodeURIComponent(form,true); //关键点
var formArray = form.split("&");
var obj = {};
for(var i = 0;i<formArray.length;i++){
var d = formArray[i].split('=');
obj[d[0]] = d[1];
}
if(obj.mobile == ''){
layer.msg("手机号不能为空");
return;
}
if(obj.plate == ''){
layer.msg("车牌号不能为空");
return;
}
if(obj.passWord == '' || obj.passWord2 == ''){
layer.msg("密码不能为空");
return;
}
if(obj.passWord != obj.passWord2){
layer.msg("两次密码不一致，请重新输入");
return;
}
my.post({
url:"user/register",
contentType : 'application/json;charset=utf-8', //设置请求头信息
data:JSON.stringify(obj),
done:function(result){
if(result.code == 200){
setTimeout(function(){
location.href = "./home";
},2000);
}
}
});
});