Javscript是一門廣泛使用于互聯網的編程語言。它可以被用于創建互動式網站，增強用戶體驗。以下是Javascript可以做的一些事情的舉例。

1. 表單驗證

<script>
function validateForm() {
var x = document.forms["myForm"]["fname"].value;
if (x == "") {
alert("名字必須填寫");
return false;
}
}
</script>
<form name="myForm" onsubmit="return validateForm()">
名字: <input type="text" name="fname">
<input type="submit" value="提交">
</form>

2. 動態效果

<button onclick="myFunction()">點我</button>
<script>
function myFunction() {
document.getElementById("demo").innerHTML = "Hello World!";
}
</script>
<p id="demo"></p>

3. 輪播圖與畫廊

<script>
var slideIndex = 1;
showSlides(slideIndex);
function plusSlides(n) {
showSlides(slideIndex += n);
}
function currentSlide(n) {
showSlides(slideIndex = n);
}
function showSlides(n) {
var i;
var slides = document.getElementsByClassName("mySlides");
if (n > slides.length) {slideIndex = 1}
if (n < 1) {slideIndex = slides.length}
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
slides[slideIndex-1].style.display = "block";
}
</script>
<div class="slideshow-container">
<div class="mySlides fade">
<div class="numbertext">1 / 3</div>
<img src="img1.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<div class="numbertext">2 / 3</div>
<img src="img2.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<div class="numbertext">3 / 3</div>
<img src="img3.jpg" style="width:100%">
</div>
<a class="prev" onclick="plusSlides(-1)">❮</a>
<a class="next" onclick="plusSlides(1)">❯</a>
</div>

4. 數據展示與圖表

<script src="https://cdn.jsdelivr.net/npm/apexcharts"></script>
<div id="chart"></div>
<script>
var options = {
chart: {
type: 'bar'
},
series: [{
name: 'sales',
data: [30,40,45,50,49,60,70,91,125]
}],
xaxis: {
categories: ['Jan','Feb','Mar','Apr','May','Jun', 'Jul', 'Aug', 'Sep']
}
}
var chart = new ApexCharts(
document.querySelector("#chart"),
options
);
chart.render();
</script>

總結來說，Javascript可以做很多事情，包括表單驗證、動態效果、輪播圖與畫廊、數據展示與圖表等等。這些功能可以讓我們的網站更加生動，增強用戶體驗。