Question

I want to create a function dynamically using javascript. I’ve started with the following:

function setFunc(setName){

    var  setName =  function () {
                    };

}
setFunc("totop");

I want to set a function dynamically, but it doesn’t work!

How can I fix this?

Answer 1

That won’t work.

However, consider this: functions in JavaScript are just values and window is the top-level scope, so… (This assumes it is desired for the new function to be created in the top-level scope.)

function setFunc (name) {
    window[name] = function () { alert("hi!") }
}
setFunc("a")
window.a()    // "hi!" - explicit property access on object
window["a"]() // "hi!" - ditto
a()           // "hi!" - window implicit as top-level

However, I do not recommend this sort of global side-effect…

Happy coding.