ES6与ES3,5的区别（二）函数默认参数{ // ES5\ES3 默认参数的写法 function f(x, y, z) { if (y === undefined) { y = 7; } if (z === undefined) { z = 42 } return x + y + z } console.lo...
ES6与ES3,5的区别（一）const区别// ES5 中常量的写法 Object.defineProperty(window, "PI2", { value: 3.1415926, writable: false, }) console.log(window.PI2) // ES6 的常量写法 const PI = 3.1415926 console...