芒果水蜜桃

for (var i = 0; i < arr....

[](https://note.youdao.com/s/MwMWrAsF) ![尚硅谷html+css学习总结 (1).png](https://p6-juejin.by...

Math.floor();向下取整 Math.ceil();向上取整 Math.round();四舍五入 Math.abs();去绝对值 Math.max()/min();...