function isRepeat() {
        var ary = new Array("111", "22","22", "33", "111");
        for (var i = 0; i < ary.length; i++) {
            console.log(ary.indexOf(ary[i]));
            if(ary.indexOf(ary[i]) != i) {
                alert("数组中有重复元素：" + ary[i])
            }
        }
    }

function isRepeat() {
        var ary = new Array("111", "22","22", "33", "111");
        var newary = ary.sort()
        for(var i = 0; i< newary.length; i++) {
            if(newary[i] == newary[i+1]) {
                alert("数组重复内容：" + newary[i]);
            }
        }
    }

function isRepeat(arr) {
    var hash = {};
    for (var i in arr) {
        if (hash[arr[i]]){
            return true; 
        }
        hash[arr[i]] = true;
    }
    return false;
}