console.log(Math.floor(5/3)); //返回值为 1
var number = 123.56;
console.log(Math.floor(number)); //返回值为123
var number = 0.56;
console.log(Math.floor(number)); //返回值为 0
var number = 10/3;
console.log(Math.floor(number)); //返回值为 3
var number = 2.5*3.5; //8.75
console.log(Math.floor(number)); // 返回值为 8