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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>JS Alert Box</title>
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</head>
<body>
<h1>JavaScript alert()</h1>
<p>
The alert() method in JavaScript is used to display a virtual alert box.
It is mostly used to give a warning message to the users. It displays an
alert dialog box that consists of some specified message (which is
optional) and an OK button. When the dialog box pops up, we have to click
"OK" to proceed.
</p>
<p>
The alert dialog box takes the focus and forces the user to read the
specified message. So, we should avoid overusing this method because it
stops the user from accessing the other parts of the webpage until the box
is closed.
</p>
<h1>Syntax</h1>
<pre
class="language-javascript"
tabindex="0"
><code class="language-javascript"><span class="token function">alert</span><span class="token punctuation">(</span>message<span class="token punctuation">)</span></code></pre>
<h1>Values</h1>
<p>
message: It is an optional string that specifies the text to display in
the alert box. It consists of the information that we want to show to the
users.
</p>
<pre
class="language-markup"
tabindex="0"
><code class="language-markup"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>JavaScript<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span><span class="token punctuation">></span></span><span class="token script"><span class="token language-javascript">
<span class="token keyword">var</span> a <span class="token operator">=</span> <span class="token number">40</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> b <span class="token operator">=</span> <span class="token number">20</span><span class="token punctuation">;</span>
<span class="token keyword">if</span><span class="token punctuation">(</span>a <span class="token operator">></span> b<span class="token punctuation">)</span><span class="token punctuation">{</span>
<span class="token function">alert</span><span class="token punctuation">(</span>b <span class="token operator">+</span> a<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>
<span class="token function">alert</span><span class="token punctuation">(</span><span class="token string">"Value of B : "</span> <span class="token operator">+</span> b<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span></code></pre>
</body>
<script>
alert("This is alert");
</script>
</html>