JSFiddle - React, Tailwind, and code Playground

by yi hom

JavaScript

function add() {
  document.write(arguments.length+"<br>");//把傳入函式的值存為一個陣列，以便引數個數不同
  var sum = 0;
  for (var i = 0, j = arguments.length; i < j; i++) {
    sum += arguments[i];
  }
  return sum;
}
var sum;
sum=add(2, 3, 4, 5); // 14

document.write(sum);