JavaScript 除法取整

方法一

Math.floor

var a = 7;
var b = 3;
var quotient = Math.floor(a / b);
console.log(quotient);  // 输出 2

方法二

parseInt

var a = 7;
var b = 3;
var quotient = parseInt(a / b);
console.log(quotient);  // 输出 2

方法三

|0

var a = 7;
var b = 3;
var quotient = (a / b)|0;
console.log(quotient);  // 输出 2