极客教程如何使用HTML、Bootstrap和JavaScript创建笔记网站
我们要做一个网站，利用HTML、CSS和JavaScript来记录我们的笔记，并将其保存起来供我们将来使用。
步骤:
- HTML。我们将使用HTML创建网站的基本框架。
- Bootstrap：与CSS相比，使我们的工作更容易。所以我们用Bootstrap来美化我们的框架。
- JavaScript。保存和删除笔记的基本逻辑在index.js文件内。
例子：在这里，我们首先设计项目的结构，然后我们将对功能进行编码。
<!DOCTYPE html>
<html lang="en">
<head>
<link rel="stylesheet" href=
"https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"
integrity=
"sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T"
crossorigin="anonymous">
<script src=
"https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity=
"sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"
crossorigin="anonymous">
</script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"
integrity=
"sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1"
crossorigin="anonymous">
</script>
<script src=
"https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"
integrity=
"sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM"
crossorigin="anonymous">
</script>
</head>
<body>
<nav class="navbar navbar-expand-lg
navbar-light bg-success">
<a class="navbar-brand" href="#">
<p style="font-size: 30px;">
THE NOTES TAKER
</p>
</a>
</nav>
<div class="container my-3">
<h1>Take your Notes here</h1>
<div class="card">
<div class="card-body">
<h5 class="card-title">
Add a Note
</h5>
<div class="form-group">
<textarea class="form-control"
id="addTxt" rows="3">
</textarea>
</div>
<button class="btn btn-primary"
id="addBtn" style=
"background-color:green">
Add Note
</button>
</div>
</div>
<hr>
<h1>Your Notes</h1>
<hr>
<div id="notes" class=
"row container-fluid">
</div>
</div>
<script src="gfg.js"></script>
</body>
</html>
showNotes();
// If user adds a note, add it to the localStorage
let addBtn = document.getElementById("addBtn");
addBtn.addEventListener("click", function(e) {
let addTxt = document.getElementById("addTxt");
let notes = localStorage.getItem("notes");
if (notes == null) notesObj = [];
else notesObj = JSON.parse(notes);
notesObj.push(addTxt.value);
localStorage.setItem("notes", JSON.stringify(notesObj));
addTxt.value = "";
showNotes();
});
// Function to show elements from localStorage
function showNotes() {
let notes = localStorage.getItem("notes");
if (notes == null) notesObj = [];
else notesObj = JSON.parse(notes);
let html = "";
notesObj.forEach(function(element, index) {
html += `<div class="noteCard my-2 mx-2 card"
style="width: 18rem;">
<div class="card-body">
<h5 class="card-title">
Note {index + 1}
</h5>
<p class="card-text">
{element}
</p>
<button id="${index}" onclick=
"deleteNote(this.id)"
class="btn btn-primary">
Delete Note
</button>
</div>
</div>`;
});
let notesElm = document.getElementById("notes");
if (notesObj.length != 0) notesElm.innerHTML = html;
else
notesElm.innerHTML = `Nothing to show!
Use "Add a Note" section above to add notes.`;
}
// Function to delete a note
function deleteNote(index) {
let notes = localStorage.getItem("notes");
if (notes == null) notesObj = [];
else notesObj = JSON.parse(notes);
notesObj.splice(index, 1);
localStorage.setItem("notes",
JSON.stringify(notesObj));
showNotes();
}
输出:
