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JavaScript (Tips (object = {key1: v1, key2: v2, key3: v3} // equal to …

JavaScript

Tips

object = {key1: v1, key2: v2, key3: v3}
// equal to
 object = {key1, key2, key3}

const {key1, key2, key3} = object

const arr = [1,2,3]
const arr2 = [...arr, 4]

const obj = {value1, value2}
const obj2 = {...obj, key:val1}

Function.prototype -> [Function]
Function.__proto__ -> [Function]
Object.prototype -> {}
Object.__proto__ -> [Function]

Function.prototype === Object.__proto__
Object.__proto__ === Function.prototype
Function.__proto__ === Function.prototype
Function.prototype.__proto__ === Object.prototype

Function.prototype === Function().__proto__

严格模式

"use strict"; //严格模式   
function a(num) {
  console.log(num === arguments[0]); // true
  num = 2;
  console.log(num === arguments[0]); // false   非严格模式为 true
}
a(1);