var value1="val1"; var value2="val2"; alert(value1&&value2); //结果为value2 alert(value1||value2); //结果为value1 相关文章: 2022-12-23 2022-12-23 2022-01-08 2022-01-01 2022-12-23 2022-12-23 2022-12-23 2022-12-23