// 选择所有段落元素
$('p').css('color', 'blue');

// 选择具有特定类的元素
$('.myClass').hide();

// 选择具有特定 ID 的元素
$('#myId').show();

// 绑定点击事件
$('#myButton').on('click', function() {
    alert('Button clicked!');
});

// 解绑点击事件
$('#myButton').off('click');

// 改变元素的文本内容
$('#myElement').text('New text');

// 改变元素的 HTML 内容
$('#myElement').html('<strong>Bold text</strong>');

// 改变元素的属性
$('#myInput').attr('placeholder', 'Enter your name');

// 淡入效果
$('#myElement').fadeIn();

// 淡出效果
$('#myElement').fadeOut();

// 滑动效果
$('#myElement').slideDown();
$('#myElement').slideUp();

// 使用 $.ajax 方法
$.ajax({
    url: 'https://api.example.com/data',
    method: 'GET',
    success: function(data) {
        console.log(data);
    },
    error: function(error) {
        console.error(error);
    }
});

// 使用 $.get 方法
$.get('https://api.example.com/data', function(data) {
    console.log(data);
});

// 使用 $.post 方法
$.post('https://api.example.com/data', { key: 'value' }, function(response) {
    console.log(response);
});

// 链式调用示例
$('#myElement').css('color', 'red').slideUp().slideDown();

const Handlebars = require('handlebars');
// 模板源
const source = "<p>Hello, {{name}}!</p>";
// 编译模板
const template = Handlebars.compile(source);
// 上下文
const context = { name: "Nick" };
// 渲染模板
const result = template(context);
console.log(result);  // 输出: <p>Hello, Nick!</p>

const Handlebars = require('handlebars');
const source = `
{{#if isAdmin}}
  <p>Welcome, admin!</p>
{{else}}
  <p>Welcome, user!</p>
{{/if}}
`;
const template = Handlebars.compile(source);
const context = { isAdmin: true };
const result = template(context);
console.log(result);

const Handlebars = require('handlebars');
const source = `
<ul>
  {{#each items}}
    <li>{{this}}</li>
  {{/each}}
</ul>
`;
const template = Handlebars.compile(source);
const context = { items: ["Item 1", "Item 2", "Item 3"] };
const result = template(context);
console.log(result);

const Handlebars = require('handlebars');
Handlebars.registerHelper('uppercase', function (str) {
    return str.toUpperCase();
});
const source = `{{uppercase name}}`;
const template = Handlebars.compile(source);
const context = { name: 'Nick' };
const result = template(context);
console.log(result);

const express = require('express');
const exphbs = require('express-handlebars');
const app = express();
+const hbs = exphbs.create({
+   helpers: {
+       uppercase: function (str) {
+           return str.toUpperCase();
+       }
+   }
+});
+
+app.engine('handlebars', hbs.engine);
app.set('view engine', 'handlebars');
app.set('views', './views');
app.get('/', (req, res) => {
+   res.render('home', { title: 'Home Page', layout: 'main' });
});
+const PORT = 3600;
app.listen(PORT, () => {
    console.log(`Server is running on http://localhost:${PORT}`);
});

const express = require('express');
const exphbs = require('express-handlebars');
const app = express();
const hbs = exphbs.create({
    helpers: {
        uppercase: function (str) {
            return str.toUpperCase();
+       },
+       inc: function (value) {
+           return parseInt(value) + 1;
+       },
+       multiply: function (a, b) {
+           return a * b;
+       },
    }
});
app.engine('handlebars', hbs.engine);
app.set('view engine', 'handlebars');
app.set('views', './views');
+const accessTree = [
+   {
+       name: 'child1',
+       children: [
+           {
+               name: 'child1.1',
+               children: [
+                   {
+                       name: 'child1.1.1',
+                       children: []
+                   }
+               ]
+           },
+           {
+               name: 'child1.2',
+               children: [
+                   {
+                       name: 'child1.2.1',
+                       children: []
+                   }
+               ]
+           }
+       ]
+   }
+];
+app.get('/tree', (req, res) => {
+   res.render('tree', { title: 'Tree', accessTree });
});
const PORT = 3600;
app.listen(PORT, () => {
    console.log(`Server is running on http://localhost:${PORT}`);
});

const bcrypt = require('bcrypt');

// 生成哈希的示例
async function hashPassword(password) {
  const saltRounds = 10;  // 盐的轮次，越高计算时间越长，安全性越高
  const hash = await bcrypt.hash(password, saltRounds);
  return hash;
}

// 使用示例
const plainPassword = 'myPlainPassword';
hashPassword(plainPassword).then(hash => {
  console.log('Hashed password:', hash);
});

const bcrypt = require('bcrypt');
// 验证密码的示例
async function verifyPassword(plainPassword, hashedPassword) {
  const match = await bcrypt.compare(plainPassword, hashedPassword);
  return match;
}
// 使用示例
const plainPassword = 'myPlainPassword';
const hashedPassword = '$2b$10$2b.qiYdCOOgr9WqlX/IVLueucF.xMe/LyeuLwNnIFQlkbS4ySPUti';  // 示例哈希
verifyPassword(plainPassword, hashedPassword).then(match => {
  if (match) {
    console.log('Password is valid!');
  } else {
    console.log('Password is invalid.');
  }
});

const bcrypt = require('bcrypt');
const saltRounds = 12;  // 你可以调整这个数值
const password = 'examplePassword';
bcrypt.hash(password, saltRounds, function(err, hash) {
  // 保存哈希到数据库中
  console.log('Hashed password with higher salt rounds:', hash);
});