我如何摆脱将“新功能”放在功能之前的问题

Question

I was wondering how can I make it posible to get rid of putting "new" before a function, for example:

new functionToDo("thingsToDo").iGotYouBruh("Halo Humans");

is there a posible way of doing this without the "new"?

here is the code I'm trying to use without the "new":

function local (title) {
    var storeTitle = title;
    this.addL = function(lString) {
        var storeText = lString;
        localStorage.setItem(storeTitle, storeText);
        console.info("Locally stored " + storeTitle.toUpperCase() + " with " + storeText.substring(0, 10) + "... As text.");
    };
    this.removeL = function() {
        localStorage.removeItem(storeTitle);
        console.info("Locally removed " + storeTitle + ".");
    };
    this.getL = function () {
        localStorage.getItem(storeTitle);
        console.info("Locally got string of " + storeTitle + ": " + localStorage.getItem(storeTitle));
    };
};

and here's what I would have to do to invoke the function:

new local("storedElement").getL();

Answer 1

This is possible by checking whether this is an instance of the function itself and returning a new instance otherwise:

function local (title) {
    if (!(this instanceof local)) {
        return new local(title);
    }

    var storeTitle = title;
    this.addL = function(lString) {
        var storeText = lString;
        localStorage.setItem(storeTitle, storeText);
        console.info("Locally stored " + storeTitle.toUpperCase() + " with " + storeText.substring(0, 10) + "... As text.");
    };
    this.removeL = function() {
        localStorage.removeItem(storeTitle);
        console.info("Locally removed " + storeTitle + ".");
    };
    this.getL = function () {
        localStorage.getItem(storeTitle);
        console.info("Locally got string of " + storeTitle + ": " + localStorage.getItem(storeTitle));
    };
};

Answer 2

You could use JavaScript closures. In particular look at the "Using Closures for the Module Pattern" section of this webpage for a full description. The idea is to have the function return an literal with all the required methods. Any functions or variables that you want to be kept private are just local variables for the function.