<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>study</title> </head> <body> <script> window.onload = function () { console.log(typeof 1) console.log(typeof "1") console.log(typeof true) console.log(Array.isArray([1, 2, 3])) console.log(Array.isArray({a: 1})) console.log(typeof null) console.log(typeof a) console.log(isNaN(1 / 0 * 0)) function aaa() { //arguments函数内置对象 console.log(arguments.length) } aaa(1, 2, 3) } </script> </body> </html>
javascript类型判断+函数内置对象arguments
原文：https://www.cnblogs.com/linding/p/13570617.html