我使用了一个名为 Submitted 的附加变量，并在页面加载时将其设置为
falseapp.get('/Recipes', (req, res) => {
// Render the EJS template with submitted set to false (initial page load)
res.render('recipe', { submitted: false });
});
每当输入菜谱名称并提交表单时，将提交的变量设置为 true。
app.post('/Recipes', (req, res) => {
// Set submitted to true to render the specific code
res.render('recipe', { submitted: true, Name: 'Recipe Name', Instructions: ['Step 1', 'Step 2'] });
});
这是我如何实现它的完整代码-
EJS模板文件：
<body>
<form action="/Recipes" method="post">
<input type="text" name="recipeName" placeholder="Enter recipe Name" required>
<button>Find</button>
</form>
<% if (submitted) { %>
<!-- The below code will only run if the form is submitted -->
<section class="GPT">
<h1><%= Name %></h1>
<% Instructions.forEach(function(instruction) { %>
<ul><%= instruction %></ul>
<% }); %>
<a href="/"><button>Home</button></a>
</section>
<% } %>
</body>
服务器端代码（NodeJS）
app.use(bodyParser.urlencoded({ extended: true }));
app.set('view engine', 'ejs');
app.get('/Recipes', (req, res) => {
// Render the EJS template with submitted set to false (initial page load)
res.render('recipe', { submitted: false });
});
app.post('/Recipes', (req, res) => {
// Process the form submission here
// Set submitted to true to render the specific code
res.render('recipe', { submitted: true, Name: 'Recipe Name', Instructions: ['Step 1', 'Step 2'] });
});