Question

该代码应弹出一个窗口，要求确认“按ok确认用户的操作”，但没有。我全都没主意了。

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
   static class Program
   {
      /// <summary>
      /// The main entry point for the application.
      /// </summary>
      [STAThread]
      static void Main()
      {
         Application.EnableVisualStyles();
         Application.SetCompatibleTextRenderingDefault(false);

         var frm = new Form()
         {
            Text = "Data Grid View Form",
            Name = "DataGridViewForm",
            Size = new System.Drawing.Size(400, 400)
         };
         var dataGridView1 = new DataGridView();

         var dataTable = new DataTable();
         dataGridView1.DataSource = dataTable;
         dataGridView1.Dock = DockStyle.Fill;

         dataTable.Columns.Add("Id", typeof(int));
         dataTable.Columns.Add("IdAsString", typeof(string));
         var r1 = dataTable.NewRow();
         r1["Id"] = 1;
         r1["IdAsString"] = "1";
         dataTable.Rows.Add(r1);

         var r2 = dataTable.NewRow();
         r2["Id"] = 11;
         r2["IdAsString"] = "11";
         dataTable.Rows.Add(r2);

         var r3 = dataTable.NewRow();
         r3["Id"] = 2;
         r3["IdAsString"] = "2";
         dataTable.Rows.Add(r3);

         var r4 = dataTable.NewRow();
         r4["Id"] = 22;
         r4["IdAsString"] = "22";
         dataTable.Rows.Add(r4);

         frm.Controls.Add(dataGridView1);

         Application.Run(frm);
      }
   }
}

PHP代码：

const { from } = require('rxjs');
const { map } = require('rxjs/operators');
const axios = require('axios');

const responsePromise = axios.get('https://jsonplaceholder.typicode.com/todos/1');
const response$ = from(responsePromise);

response$
    .pipe(
        map(response => ({ type: 'RESPONSE_RECEIVED', payload: response.data}))
    )
    .subscribe(console.log);

打开控制台，我看到“未捕获的SyntaxError：无效或意外的令牌”

Answer 1

控制台问题与JavaScript代码的第2行和第3行有关；

var conf = confirm("Press OK to confirm the '"+type+"' action for user
<?php echo $u; ?>.");

您有一个多行字符串，控制台没有将其解释为一个字符串值。为了解决这个问题，ECMAScript 6 (ES6)引入了模板文字，可以像下面那样使用它来处理多行字符串；

var conf = confirm(`Press OK to confirm the '"+type+"' action for user
<?php echo $u; ?>.`);

（即使用反引号而不是双引号来开始和结束多行字符串）

或者，如果不支持ES6，则可以使用如下所示的旧式String串联；

var conf = confirm("Press OK to confirm the '"+type+"' action for user" +
"<?php echo $u; ?>.");

未捕获的SyntaxError：

1 个答案: