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HTML Practical 13 (2nd to 4th)| Web-Programming | WebDevs I CS
2). Functions
JavaScript functions are used to perform operations. We can call JavaScript function many times to reuse the code.
Syntax:
function functionName([arg1, arg2, ...argN])
{
//code to be executed
}
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<html>
<body>
<script>
function msg(){
alert("hello! this is message");
}
</script>
<input type="button" onclick="msg()" value="call function"/>
</body>
</html>
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<html>
<body>
<script>
function getcube(number){
alert(number*number*number);
}
</script>
<form>
<input type="button" value="click" onclick="getcube(4)"/>
</form>
</body>
</html>
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<html>
<body>
<script>
var add=new Function("num1","num2","return num1+num2");
document.writeln(add(2,5));
</script>
</body>
</html>
3. JavaScript Boolean
Boolean is a datatype that returns either of two values i.e. true or false.
Syntax: Boolean(variable/expression)
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<html>
<body>
<h2>JavaScript Booleans</h2>
<script>
document.write(Boolean(10 > 9));
</script>
</body>
</html>
4. Math
The JavaScript Math object allows you to perform mathematical tasks on numbers.
Syntax: Math.property.
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<html>
<body>
<script>
document.write(Math.PI);
</script>
</body>
</html>
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<html>
<body>
<script>
document.write
("<p><b>Math.E:</b> " + Math.E + "</p>" +
"<p><b>Math.PI:</b> " + Math.PI + "</p>" +
"<p><b>Math.SQRT2:</b> " + Math.SQRT2 + "</p>" +
"<p><b>Math.SQRT1_2:</b> " + Math.SQRT1_2 + "</p>" +
"<p><b>Math.LN2:</b> " + Math.LN2 + "</p>" +
"<p><b>Math.LN10:</b> " + Math.LN10 + "</p>" +
"<p><b>Math.LOG2E:</b> " + Math.LOG2E + "</p>" +
"<p><b>Math.Log10E:</b> " + Math.LOG10E + "</p>");
</script>
</body>
</html>
➪Math methods():
i. Math.round()
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<html>
<body>
<script>
document.write(Math.round(4.6));
</script>
</body>
</html>
ii. Math.ceil()
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<html>
<body>
<script>
document.write(Math.ceil(4.4));
</script>
</body>
</html>
iii. Math.floor()
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<html>
<body>
<script>
document.write(Math.floor(4.7));
</script>
</body>
</html>
<html>
<body>
<script>
document.write(Math.floor(4.7));
</script>
</body>
</html>
iv. Math.trunc()
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<html>
<body>
<script>
document.write(Math.trunc(4.7));
</script>
</body>
</html>