laravel framework (add, display, delete, modify, after the search page)

Controller code

public function index()
    {
        return view('user/index');
    }
    //执行添加
    public  function  add(Request $request){
        $username=$request->input('username');
        $pwd=$request->input('pwd');
        $res= DB::table('user')->insert([
            'username' =>$username,
            'pwd' =>$pwd,
        ]);
        if($res){
            return Redirect('show');
        }
        else{
            die('添加失败');
        }
    }
    //分页查询开始
    public function show(){
        $search = isset($_GET['search'])?$_GET['search ']: ""; // determines whether or not to take over the search value 
        if ($ search)
        { 
            $ DB :: ARR = SELECT ( "SELECT * WHERE from User username like '% $% Search'"); // query with the search condition 
        } the else { 
            $ DB :: Table ARR = ( 'User') -> GET (); // query search condition without 
        } 
        // total number of pieces 
        $ COUNT = COUNT ($ ARR); 
        // number per page 
        $ = MYS. 3; 
        // calculate the total number of pages 
        $ zys = ceil ($ count / $ MYS); 
        // get the current page 
        $ page = isset (the GET $ _ [ 'page']) the GET $ _ [ 'page']:?. 1; 
        // offset 
        $ pyl = ($ page-1 ) * $ mys ; 
        IF ($ Search) 
        { 
            $ DB :: ARR = SELECT ( "SELECT * WHERE from User username like '% $% Search' limit PYL $, $ MYS");// page with search criteria query 
            / * foreach ($ arr as $ key => $ value) {
                $arr[$key]['username'] = str_replace($search, "<font color='red'>$search</font>", $value['username']);
            }*/
        }else{
            $arr = DB::table('user')->skip($pyl)->take($mys)->get();//带分页条件查询
        }
        //上一页
        $last = $page-1<1?1:$page-1;
        //下一页
        $next = $page+1>$zys?$zys:$page+1;
        // print_R($next);die;
        return view('user/show',['res'=>$arr,'search'=>$search,'last'=>$last,'next'=>$next,'sum_page'=>$zys,'page'=>$page]);        $ ID = $ request-> INPUT ( 'ID');    public function del (the Request Request $) {// delete    // End paging query
    }




        $res=DB::table('user')->where('id',$id)->delete();
        if($res==1){
            return redirect('show');
        }
    }
    //修改页面
    public function upd(Request $request){
        $id=$request->input('id');
        $arr=DB::table('user')->where('id',$id)->first();
        return view('user/update',['arr'=>$arr]);
    }
    //执行修改
    public function update(Request $request){
        $id=$request->input('id');
        $username=$request->input('username');
        $pwd=$request->input('pwd');
        $res=DB::table('user')->where('id',$id)->update(array('username'=>$username,'pwd'=>$pwd));
        if($res==1){
            the redirect return ( 'Show'); 
        } 
    } 

add pages

<form action="add" method="get">
    <table>
        <tr>
            <td>用户名</td>
            <td><input type="text" name="username"/></td>
        </tr>
        <tr>
            <td>密码：</td>
            <td><input type="password" name="pwd"/></td>
        </tr>
        <tr>
            <td></td>
            <td><input type="submit" value="登录"/></td>
        </tr>
    </table>
</form>

展示页面

<center>
    <div id="div1">
        <input type="text" name="search" value="{{$search}}"/><button onclick="page(<?php echo $page?>)">搜索</button>
        <table border="1">
            <tr>
                <td>ID</td>
                <td>用户名</td>
                <td>密码</td>
                <td>操作</td>
            </tr>
            @foreach($res as $key=>$val)
                <tr>
                    <td>{{$val->id}}</td>
                    <td>{{$val->username}}</td>
                    <td>{{$val->pwd}}</td>
                    <td><a href="{{url('del')}}?id={{$val->id}}">删除</a>||<a href="{{url('upd')}}?id={{$val->id}}">修改</a></td>
                </tr>
            @endforeach
        </table>
        当前页<?php echo $page?>共<?php echo $sum_page?>
        <a href="javascript:void (0)" onclick="page(1)">首页</a>
        <a href="javascript:void (0)" onclick="page(<?php echo $last?>)">上一页</a>
        <a href="javascript:void (0)" onclick="page(<?php echo $next?>)">下一页</a>
        <a href="javascript:void (0)" onclick="page(<?php echo $sum_page?>)">尾页</a>
    </div>
</center>

<script>
    //分页
    function page(page){
        var search=document.getElementsByName('search')[0].value;
        var ajax=new XMLHttpRequest();
        ajax.open('get','{{url('show')}}?page='+page+'&search='+search);
        ajax.send();
        ajax.onreadystatechange=function(){
            if(ajax.readyState==4&ajax.status==200){
                document.getElementById('div1').innerHTML=ajax.responseText;
            }

        }
    }
</script>

修改页面

<form action="{{url('update')}}" method="get">
    <table>
        <input type="hidden" name="id" value="{{$arr->id}}"/>
        <tr>
            <td>用户名</td>
            <td><input type="text" name="username" value="{{$arr->username}}"/></td>
        </tr>
        <tr>
            <td>密码：</td>
            <td><input type="password" name="pwd" value="{{$arr->pwd}}"/></td>
        </tr>
        <tr>
            <td></td>
            <td><input type="submit" value="修改"/></td>
        </tr>
    </table>
</form>

web页面

Route::any('index','UserController@index' );
Route::any('add','UserController@add' );
Route::any('show','UserController@show' );
Route::any('del','UserController@del' );
Route::any('upd','UserController@upd' );
Route::any('update','UserController@update' );