<input data-idx="1" type="text" name="username" confirm-type="next" bindinput="usernameValue" bindconfirm="confirmListener" focus="{{focus && focusIndex == 1}}"/> <input data-idx="2" type="text" name="password" bindinput="passwdValue" bindconfirm="confirmListener" focus="{{focus && focusIndex == 2}}" password/> js: data:{ focusIndex:1 },   confirmListener:function(e){     setTimeout(() => {       let currentIndex=e.currentTarget.dataset.idx       if(currentIndex < 2){         this.setData({ focusIndex:currentIndex + 1 })       }else{         this.setData({focus:false})       }       console.log(this.data.focusIndex)           }, 300);   }, 动态修改focusIndex参数，currentIndex+1这个不对应该如何写？

H5登录js代码     var login=function(){         var a={             Name:$("#login-details input[name='Name']").val(),             Password:$("#login-details input[name='Password']").val(),             remember:$("#login-details input[name='remember']").is(":checked")?1:0};         $.ajax({             url:"/User/Login",             type:"post",             dateType:"json",             data:a,             success:function(c){                 if(c.result!=1){                     $("#login-details span[data-target='login-msg']").text(c.msg).show()                 }                 else{                     var b=document.referrer;                     if(b==""||b==undefined||b==null){                         location.href="https://www.lantola.com"                     }                     else{                         location.href=""+b+""                     }                 }             },             error:function(b){}         });         return false     }; 小程序wxml   <form action="" bindsubmit="loginSubmit">     <view>手机号码 / 企业名称</view>     <view><input type="text" name="username" confirm-type="next"/></view>     <view>密码</view>     <view><input type="text" name="password" password/></view>     <label>       <checkbox checked="checked"></checkbox>       <text>保持登录状态</text>     </label>     <button formType="submit">登录</button>   </form> 小程序js var app = getApp(); Page({   /**    * 页面的初始数据    */   data:{     username:'',     password:''   },   loginSubmit:function(e){     let{username,password}=e.detail.value;     if(!username || !password){       wx.showToast({         title: '用户名或密码错误',         icon:'none'       })     }   } }) 用的腾讯云服务器，H5是程序猿写的。目前自学小程序写法，不知道这个$.ajax({ })该怎么写。是不是很难学？求指点 只会写错误时信息提示。。。