jquery - How to change the value of variable in a function in javascript?

var e = 15;


function change_value(e){

    e = 10;
}

change_value(e);

console.log(e);

The Value of e is still 15.

Answer

The e inside the function scope is different from the e inside the global scope.

Just remove the function parameter:

var e = 15;

function change_value(){

    e = 10;
}

change_value();
console.log(e);