/// 
/// 数组去重/// 
/// 去重的字段名 Array.prototype.distinct = function (fieldName) {    var arr = this;    var uniqueArr = [];    var includedKey = {};    for (var i = 0; i < arr.length; i++) {        var value = arr[i][fieldName];        if (includedKey[value]) continue;        uniqueArr.push(arr[i]);        includedKey[value] = 1;    }    return uniqueArr;}// 测试var test = [{ id: '1' }, { id: '2' }, { id: '2' }, { id: '1' }, { id: '3' }];test = test.distinct('id');alert(JSON.stringify(test));