<!DOCTYPE html>
<html>
<body>
<p>The internal clock in JavaScript starts at midnight January 1, 1970.</p>
<p>The getTime() function returns the number of milliseconds since then:</p>
<p id="demo"></p>
<script>
var d = new Date();
document.getElementById("demo").innerHTML = d.getTime();
</script>
</body>
</html>
<!DOCTYPE html>
<html>
<body>
<p>the join() method joins array elements into a string.</p>
<p id="demo"></p>
<script>
var fruits = ["Banana", "Orange", "Apple", "Mango"];
document.getElementById("demo").innerHTML = fruits.join(" * ");
</script>
</body>
</html>
Diğerlerinide deneyin
fruits.toString();
fruits.pop();
fruits.push("Kiwi");
fruits.shift();
fruits.unshift("Lemon");
fruits[0] = "Kiwi";
fruits[fruits.length] = "Kiwi";
fruits.splice(2, 0, "Lemon", "Kiwi");
fruits.sort();
var citrus = fruits.slice(1, 3);
Js Booleans
<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
var b1 = Boolean(100);
var b2 = Boolean(3.14);
var b3 = Boolean(-15);
var b4 = Boolean("Hello");
var b5 = Boolean('false');
var b6 = Boolean(1 + 7 + 3.14);
document.getElementById("demo").innerHTML =
"100 is " + b1 + "<br>" +
"3.14 is " + b2 + "<br>" +
"-15 is " + b3 + "<br>" +
"Any (not empty) string is " + b4 + "<br>" +
"Even the string 'false' is " + b5 + "<br>" +
"Any expression (except zero) is " + b6;
</script>
</body>
</html>
Js Karşılaştırma
<!DOCTYPE html>
<html>
<body>
<p>Input your age and click the button:</p>
<input id="age" value="18" />
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var age, voteable;
age = document.getElementById("age").value;
voteable = (age < 18) ? "Too young":"Old enough";
document.getElementById("demo").innerHTML = voteable + " to vote.";
}
</script>
</body>
</html>
JS If kullanımı
<!DOCTYPE html>
<html>
<body>
<p>Click the button to get a time-based greeting:</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var greeting;
var time = new Date().getHours();
if (time < 10) {
greeting = "Good morning";
} else if (time < 20) {
greeting = "Good day";
} else {
greeting = "Good evening";
}
document.getElementById("demo").innerHTML = greeting;
}
</script>
</body>
</html>
Js Swicth
<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
var day;
switch (new Date().getDay()) {
case 0:
day = "Sunday";
break;
case 1:
day = "Monday";
break;
case 2:
day = "Tuesday";
break;
case 3:
day = "Wednesday";
break;
case 4:
day = "Thursday";
break;
case 5:
day = "Friday";
break;
case 6:
day = "Saturday";
break;
}
document.getElementById("demo").innerHTML = "Today is " + day;
</script>
</body>
</html>
Js For Kullanımı
<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
var cars = ["BMW", "Volvo", "Saab", "Ford"];
var i;
for (i = 0, l = cars.length, text = ""; i < l; i++) {
text += cars[i] + "<br>";
}
document.getElementById("demo").innerHTML = text;
</script>
</body>
</html>
Js While
<!DOCTYPE html>
<html>
<body>
<p>Click the button to loop through a block of code as long as i is less than 10.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var text = "";
var i = 0;
while (i < 10) {
text += "<br>The number is " + i;
i++;
}
document.getElementById("demo").innerHTML = text;
}
</script>
</body>
</html>
Js Do While
<!DOCTYPE html>
<html>
<body>
<p>Click the button to loop through a block of code as long as i is less than 10.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var text = ""
var i = 0;
do {
text += "<br>The number is " + i;
i++;
}
while (i < 10)
document.getElementById("demo").innerHTML = text;
}
</script>
</body>
</html>
Js Breaks ve Continue
<!DOCTYPE html>
<html>
<body>
<p>Click the button to do a loop with a break.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var text = "";
var i;
for (i = 0; i < 10; i++) {
if (i === 3) {continue;} // break yazıp çalıştır.
text += "The number is " + i + "<br>";
}
document.getElementById("demo").innerHTML = text;
}
</script>
</body>
</html>
Js Replace
<!DOCTYPE html>
<html>
<body>
<p>Replace "microsoft" with "W3Schools" in the paragraph below:</p>
<button onclick="myFunction()">Try it</button>
<p id="demo">Please visit Microsoft!</p>
<script>
function myFunction() {
var str = document.getElementById("demo").innerHTML;
var txt = str.replace(/microsoft/i,"W3Schools");
document.getElementById("demo").innerHTML = txt;
}
</script>
</body>
</html>
Try Catch
<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
try {
adddlert("Welcome guest!");
}
catch(err) {
document.getElementById("demo").innerHTML = err.message;
}
</script>
</body>
</html>
Try Catch Finally
<!DOCTYPE html>
<html>
<body>
<p>Please input a number between 5 and 10:</p>
<input id="demo" type="text">
<button type="button" onclick="myFunction()">Test Input</button>
<p id="message"></p>
<script>
function myFunction() {
var message, x;
message = document.getElementById("message");
message.innerHTML = "";
x = document.getElementById("demo").value;
try {
x = Number(x);
if(x == "") throw "is empty";
if(isNaN(x)) throw "is not a number";
if(x > 10) throw "is too high";
if(x < 5) throw "is too low";
}
catch(err) {
message.innerHTML = "Input " + err;
}
finally {
document.getElementById("demo").value = "";
}
}
</script>
</body>
</html>
