Question

The following code already exists in one of the javascript files i am working , may i know what does the following do

Its jquery ajax , i saw the response result and its a json string which is manually created by the backend.

I want to know what is eval doing here

success: function (response) {
 var response= response.replace(/\\/g, "%5C");
 eval(response); 
 },

Answer 1

eval executes the passed in string as if it were javascript code.

What exactly happens depends entirely on the contents of response.

That is, the value of the response variable that is passed to the eval function gets evaluated as normal javascript.

If response was "alert('Hello from evel!');", you would see an alert box with the text “Hello from evel!”.