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Evaluates or executes an argument
If the argument is an expression, eval() evaluates the expression
If the argument is one or more JavaScript statements, eval() executes the statements
Syntax:
eval string
For example
<html> <body> <script language="javascript"> function fun_name(){ var full_name = 'Aditya Tiwari'; var mySentence = eval('"My name is " + full_name'); alert(mySentence); } </script> <button onclick="fun_name()">Eval function</button> </body> </html>
Output:

floor()Method
The floor() method rounds a number to the nearest integer, and returns the result.
syntax:Math.floor (value)
For Example
<html> <body> <script language="javascript"> function math_val(){ var val = 1.1; var stat = eval('"Actual value is=" + val +" "+ "After truncate value is= " + Math.floor(1.1)'); alert(stat); } </script> <button onclick="math_val()">FLOOR</button> </body> </html>
Output:

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