1.定义路由
Route::get('demo','DemoController@demo');
2.定义控制器(内with();方法就是定义传递的值 key=>value)=>"with什么什么在一起;跟; 有; 具有; 带有; 用; 使用; 以; 借;的意思（翻译）"
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
class DemoController extends Controller
{
//
public function demo(){
return view('demo')->with('name','我叫张三');
}
}
3.前端blade模板调用
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>向视图传递值</title>
</head>
<body>
<h2 style="font-family: "Hiragino Sans GB", "微软雅黑", "华文细黑", "STHeiti", "Microsoft YaHei", SimHei, "Helvetica Neue", Helvetica, Arial, sans-serif">向视图传递值</h2>
<script>
window.onload=function () {
alert('{{$name}}');
}
</script>
</body>
</html>
4.显示视图如下（ps:需要注意的是 $name在前端是变量一定要注意）
