从函数更新全局值

Question

everybody. I'm working on a project and I have two functions for a slideshow using the same global variable. I want the value to carry between the functions, instead of resetting to 1 every time you switch. Is it possible to permanently update a global variable from a function or do I need to really rethink my code?

Answer 1

You basically answered your own question, as long as the variable is global and let or var . You can't permanently change something in JS. With that being said, let variables can't become const and const variables can become let but you can keep a value inside a function or make it global and change the value of it through a function. Try something like this:

let myVariable = 0;

const loopOne = () => {

    for(let i = 0; i < 5; i++){

        myVariable++;
    };
  return true;
};

const loopTwo = () => {

    for(let i = 0; i < 5; i++){

        myVariable++;
    };
  return true;
};

loopOne();
loopTwo();