JavaScript: How to change a string into a valid expression?

Question

I'm working on a scientific JavaScript-based calculator.. I've been having a little trouble, so I'm trying a new method where the expression (Let's say 3+3) is a string inside an input div.. Then when somebody presses the "=" button, I want JavaScript to compute it. But the problem I'm having is getting JavaScript to evaluate a string as an expression. How can I convert the string into a mathematical expression?
Here's the code:
function compute(){
var input = document.getElementById("input");
var output = document.getElementById("output");
output.innerHTML = input.innerHTML;
}
So let's say I have 3+3 in the input div.. And I want 6 to pop out in the output div. How do I change the function so that 3+3, the string, is computed into 6?

Answer 1

Have fun.

Answer 2

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Answer 3

//Get input value

var input = document.getElementById("input").value;



//Get DIV tag object

var output = document.getElementById("output");



//Assign out value

output.innerHTML = parseInt(input ) + parseInt(input );