You may need to use return in JS, summarize and explain! ! !

return value

The Return statement terminates the function execution and returns a specified value to the caller of the function (function name + () is equal to the return value of the function)
If there is no return value after return, undefined will be returned by default
The return value of the function can be any data type

 // function fn(){
        // console.log("Hello");
        // }
        // fn();
        function fn() {
            return "Hello";
        }
        fn(); // fn() === hello
        console.log(fn());

        var div = function (a, b) {
            return a / b;
        }
        var result = div(81, 9);
        console.log(result);

       //Return the specified array
        var arr = [];
        function getArr(a) {
            for (let i = 0; i < a; i++) {
                arr.push(i + 1);
            }
            return arr;
        }
        var result1 = getArr(8);
        console.log(result1);
         //Return a~b array
        var arr1 = [];
        function getArr1(a, b) {
            for (let i = a; i <= b; i++) {
                arr1.push(i);
            }
            return arr1;
        }
        console.log(getArr1(2, 6));

       // reverse the order
        var arr2 = [];
        function getArr2(a, b) {
            if (a < b) {
                for (let i = a; i <= b; i++) {
                    arr2.push(i);
                }
            } else {
                for (let i = b; i <= a; i++) {
                    arr2.push(i)
                }
            }
            return arr2;
        }
        console.log(getArr2(12, 6));

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