Java script errors & exceptions handling

JavaScript - Errors &
Exceptions Handling

Here is the try...catch...finally block syntax −
<script type = "text/javascript">

</script>

<html>
<head>
function myFunc() {
var a = 100;
alert("Value of variable a is : " + a );
}
</script>
</head>

<body>
<p>Click the following to see the result:</p>
<form>
<input type = "button" value = "Click Me" onclick = "myFunc();" />
</form>
</body>
</html>

<html>
<head>
function myFunc() {
var a = 100;
try {
}
catch ( e ) {
alert("Error: " + e.description );
}
}
</script>
</head>
<body>
<form>
</form>
</body>
</html>

<html>
<head>
function myFunc() {
var a = 100;
try {
}
catch ( e ) {
alert("Error: " + e.description );
}

finally {
alert("Finally block will always execute!" );
}
}
</script>
</head>
<body>
<form>
</form>
</body>
</html>

<html>
<head>
function myFunc() {
var a = 100;
var b = 0;
try {
if ( b == 0 ) {
throw( "Divide by zero error." );
} else {
var c = a / b;
}
}
catch ( e ) {
alert("Error: " + e );
}
}
</script>
</head>
<body>
<form>
</form>
</body>
</html>

<html>
<head>
window.onerror = function () {
alert("An error occurred.");
}
</script>
</head>
<body>
<form>
</form>
</body>
</html>

<html>
<head>
window.onerror = function (msg, url, line) {
alert("Message : " + msg );
alert("url : " + url );
alert("Line number : " + line );
}
</script>
</head>
<body>
<form>
</form>
</body>
</html>

Java script errors & exceptions handling

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