js 判断数组中是否有某值

    function arrHasValue(v, arr) {

        var output = false;

        for (var i in arr) {

            if (v == arr[i]) {

                output = true;

                return output;

            }

        }

        output = false;

        return output;

    }

var arrs = ['1','2','3'];　　

console.log(arrHasValue(1,arrs)); //true