How to call anonymus function from a string

Question

I have a function definition for an anonymous string, but what can I call it. Assume a function like this:

var fn_str = "function(){ alert('called'); }";

I tried eval, but got an error that the function must have a name.

eval(fn_str).apply(this); // SyntaxError: function statement requires a name

+5

Kristian Mar 09 '12 at 8:26

3 answers

You can create functions from strings using the Function constructor:

var fn = new Function("arg1", "alert('called ' + arg1);");
fn.apply(this)

+3

steveukx Mar 09 '12 at 8:39

:

var a = "(function(){ alert('called'); })";
eval(a).apply(this);

+1

Kristian 09 . '12 8:27

gdoron · Accepted Answer · 2012-03-09T08:28:52+0000

You can use Expression Exposed Expression Expression:

var fn_str = "function(){ alert('called'); }";
eval('(' + fn_str +')();');

Another way is to use an object Function(if you have a function body string):

var func = new Function("alert('called')");
func.apply(this);