crystal_iwwish 2021-11-25 18:44:49
java javascript CSDN 参数 javascript-


 // 参数默认值:给参数一个默认值,未定义默认值,参数的默认值为 `undefined`
function fn(n = 0, m = 0) {

let he = n + m;
fn(undefined, 456);


在函数内部有一个对象,叫做arguments( 作用是动态获取函数的实参),用于接受所有的实参

 function fn() {

for (let i = 0; i < arguments.length; i++) {

console.log(arguments[i]); //伪数组,可以有下标,接受所有实参
fn(1, 2, 3, 4);



function fn(...a){

for(let i=0;i<a.length;i++){


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