Math.ceil()上取整 Math.floor()下取整 Math.round()四舍五入取整 Math.random() 0<=random<1 Math.max(); Math.min(); ~~~ <script> /* Array,Object,Function,Date,Math,Error,Regpx */ console.log(Math.ceil(3.4)); console.log(Math.floor(3.4)); console.log(Math.round(3.56)); console.log(Math.random()); console.log(Math.max(1,2,3)); console.log(Math.min(1,2,3)); </script> ~~~