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Example of merging and sorting arrays in JavaScript_Basic knowledge

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2016-05-16 15:35:181339browse

Combine two arrays - concat()
Source code:

<!DOCTYPE html>
<html>
<body>
&#8203;
<p id="demo">点击按钮合并数组。</p>
&#8203;
<button onclick="myFunction()">点我</button>
&#8203;
<script>
function myFunction()
{
var hege = ["Cecilie", "Lone"];
var stale = ["Emil", "Tobias", "Linus"];
var children = hege.concat(stale);
var x=document.getElementById("demo");
x.innerHTML=children;
}
</script>
&#8203;
</body>
</html>

Test results:

Cecilie,Lone,Emil,Tobias,Linus


Combine three arrays - concat()
Source code:

<!DOCTYPE html>
<html>
<body>

<script>

var parents = ["Jani", "Tove"];
var brothers = ["Stale", "Kai Jim", "Borge"];
var children = ["Cecilie", "Lone"];
var family = parents.concat(brothers, children);
document.write(family);

</script>

</body>
</html>

Test results:

Jani,Tove,Stale,Kai Jim,Borge,Cecilie,Lone


Array sorting (alphabetical ascending) - sort()
Source code:

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

Test results:

Apple,Banana,Mango,Orange

Numerical sorting (ascending numerical order) - sort()
Source code:

<!DOCTYPE html>
<html>
<body>
&#8203;
<p id="demo">Click the button to sort the array.</p>
&#8203;
<button onclick="myFunction()">Try it</button>
&#8203;
<script>
function myFunction()
{
var points = [40,100,1,5,25,10];
points.sort(function(a,b){return a-b});
var x=document.getElementById("demo");
x.innerHTML=points;
}
</script>
&#8203;
</body>
</html>

Test results:

1,5,10,25,40,100

Numerical sorting (descending numerical order) - sort()
Source code:

<!DOCTYPE html>
<html>
<body>
&#8203;
<p id="demo">Click the button to sort the array.</p>
&#8203;
<button onclick="myFunction()">Try it</button>
&#8203;
<script>
function myFunction()
{
var points = [40,100,1,5,25,10];
points.sort(function(a,b){return b-a});
var x=document.getElementById("demo");
x.innerHTML=points;
}
</script>
&#8203;
</body>
</html>

Test results:

100,40,25,10,5,1

Reverse the order of elements in an array - reverse()
Source code:

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

Test results:

Mango,Apple,Orange,Banana

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