JS循环数组几种方式

  data1 = [];
                data1.push({ value: "", text: "请选择" });
                json.data.result.forEach(function (e) {
                    data1.push(e);
                });
                var index=0;
                while (index < json.data.result.length) {
                    data1.push(json.data.result[index++]);
                }
                var index = 0;
                do{
                    data1.push(json.data.result[index++])
                } while (index < json.data.result.length)