JavaScript
for...in Loop
The JavaScript for...in statement loops
through the properties of an object.
Syntax
for (variable in object)
{
code to be executed
}
{
code to be executed
}
Note: The block of code inside of the for...in loop will be executed
once for each property.
Example
Looping through the properties of an object:
Example
var
person={fname:"John",lname:"Doe",age:25};
for (x in person)
{
txt=txt + person[x];
}
for (x in person)
{
txt=txt + person[x];
}
<!DOCTYPE html>
<html>
<body>
<p>Click the button to loop through the properties of
an object named "person".</p>
<button onclick="myFunction()">Try
it</button>
<p id="demo"></p>
<script>
function myFunction()
{
var x;
var txt="";
var
person={fname:"John",lname:"Doe",age:25};
for (x in person)
{
txt=txt + person[x];
}
document.getElementById("demo").innerHTML=txt;
}
</script>
</body>
<!-- http://improvejavascript.blogspot.in/-->
</html>
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