js 判断数组中是否有重复值

function arrHasvalue(arr) {
        var nary = arr.sort();
        for (var i = 0; i < arr.length; i++) {
            if (nary[i] == nary[i + 1]) {
                // console.log("数组重复内容：" + nary[i]);
                return true;
            }else{
                return false;
            }
        }
    }

var ary = new Array("111", "22", "33", "111");

console.log(arrHasvalue(ary)); //true