JSON数组去重算法

需求描述：去除JSON数组中paymode字段相同的项，并将paymoney累加。

paylist:[{paymode:"1",payname:"现金"，paymoney:"20"},
{paymode:"2",payname:"支付宝"，paymoney:"50"},{paymode:"1",payname:"现金"，paymoney:"40"}]

function UniquePay(paylist){
    var payArr = [paylist[0]];
    for(var i = 1; i < paylist.length; i++){
        var payItem = paylist[i];
        var repeat = false;
        for (var j = 0; j < payArr.length; j++) {
          if (payItem.paymode == payArr[j].paymode) {
                payArr[j].paymoney = parseFloat(payArr[j].paymoney)+parseFloat(payItem.paymoney);
                 repeat = true;
                 break;
          }
     }
              if (!repeat) {
                  payArr.push(payItem);
              }
    }
    return payArr;
}

通用的JSON数组去重

/*
 * JSON数组去重
 * @param: [array] json Array
 * @param: [string] 唯一的key名，根据此键名进行去重
 */
function uniqueArray(array, key){
    var result = [array[0]];
    for(var i = 1; i < array.length; i++){
        var item = array[i];
        var repeat = false;
        for (var j = 0; j < result.length; j++) {
            if (item[key] == result[j][key]) {
                repeat = true;
                break;
            }
        }
        if (!repeat) {
            result.push(item);
        }
    }
    return result;
}