微信小程序 json 數組push 不重複 數據

  ans_click: function (e,that,json, pageindex) {
    var id = e.currentTarget.dataset.id;
    var args = json.questions[pageindex]['Question']['ans_sel'];
        var isExit = false;
        for (var i = 0; i < args.length; i++) {
          if (args[i] == id) {
            isExit = true;
            break;
          }
        }
        if (!isExit) {
          json.questions[pageindex]['Question']['ans_sel'].push(id);
        }
        that.setData({ questions: json.questions[pageindex] });

}