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Summary of methods to add elements to JavaScript arrays_Basic knowledge

WBOYOriginal: 2016-05-16 15:35:131562browse

Add new element at the beginning of the array - unshift()
Source code:

<!DOCTYPE html>
<html>
<body>

<p id="demo">Click the button to add elements to the array.</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction()
{
var fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.unshift("Lemon","Pineapple");
var x=document.getElementById("demo");
x.innerHTML=fruits;
}
</script>

<p><b>Note:</b> The unshift() method does not work properly in Internet Explorer 8 and earlier, the values will be inserted, but the return value will be <em>undefined</em>.</p>

</body>
</html>

Test results:

Lemon,Pineapple,Banana,Orange,Apple,Mango

Add an element at position 2 of the array - splice()
Source code:

<!DOCTYPE html>
<html>
<body>
&#8203;
<p id="demo">Click the button to add elements to the array.</p>
&#8203;
<button onclick="myFunction()">Try it</button>
&#8203;
<script>
function myFunction()
{
var fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.splice(2,0,"Lemon","Kiwi");
var x=document.getElementById("demo");
x.innerHTML=fruits;
}
</script>
&#8203;
</body>
</html>

Test results:

Banana,Orange,Lemon,Kiwi,Apple,Mango

Add new elements to the end of the array - push()
Source code:

<!DOCTYPE html>
<html>
<body>
&#8203;
<p id="demo">Click the button to add a new element to the array.</p>
&#8203;
<button onclick="myFunction()">Try it</button>
&#8203;
<script>
var fruits = ["Banana", "Orange", "Apple", "Mango"];
&#8203;
function myFunction()
{
fruits.push("Kiwi")
var x=document.getElementById("demo");
x.innerHTML=fruits;
}
</script>
&#8203;
</body>
</html>

Test results:

Banana,Orange,Apple,Mango,Kiwi

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