在值前加+

I would like to add plus(+) before value.

Code as:

function todayplus() {
    var url="./get/invoice.php";
    jQuery('+' $ "#todayplus").load(url);
}

Result should be + something (plus before value)

Do you mean you want this?

function todayplus() {
    var url="./get/invoice.php";
    $("#todayplus").load(url);
    $("#todayplus").prepend("+");
}