微信小程序 多項選擇 選中或者取消方法

var id = e.currentTarget.dataset.id;
var selresid = e.currentTarget.dataset.selres;
var args = json.questions[pageindex]['Question']['ans_sel'];
        if (selresid==4)
        {
          var tmp_index = args.join("").indexOf(id);
           args.splice(tmp_index, 1);
        }
        else
        {
        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] });