Definition: Convert String to Number.
The Number() function converts the object argument to a number that represents the object's value.
If the value cannot be converted to
a legal number, NaN is returned.
In short,
Number() method will convert string to number.
Example A:
Javascript function
function add(a,b)
{
var ans;
var i = a;
var j = b;
ans = Number(a) + Number(b);
alert("Your answer: " + ans);
}
{
var ans;
var i = a;
var j = b;
ans = Number(a) + Number(b);
alert("Your answer: " + ans);
}
<div>
<input type="text" id="txta" />
<input type="text" id="txtb" />
<input type="button" id="btnAdd" value="Addition" onclick="add(document.getElementByI('txta').value,document.getElementById('txtb').value);" />
</div>
<input type="text" id="txta" />
<input type="text" id="txtb" />
<input type="button" id="btnAdd" value="Addition" onclick="add(document.getElementByI('txta').value,document.getElementById('txtb').value);" />
</div>
Output:
Example B:
<script type="text/javascript" language="javascript">
var test1= new Boolean(true);
var test2= new Boolean(false);
var test3= new Date();
var test4= new String("999");
var test5= new String("999 888");
document.write(Number(test1)+ "<br />");
document.write(Number(test2)+ "<br />");
document.write(Number(test3)+ "<br />");
document.write(Number(test4)+ "<br />");
document.write(Number(test5)+ "<br />");
</script>
Output:
1
0
1335442904505
999
NaN
0
1335442904505
999
NaN
