判断两个对象的值是否相等

源代码

function isEqual (a, b) {  const classNameA = toString.call(a)  const classNameB = toString.call(b)  // 如果数据类型不相等，则返回false  if (classNameA !== classNameB) {    return false  } else {    // 如果数据类型相等，再根据不同数据类型分别判断    if (classNameA === '[object Object]') {      for (let key in a) {        if (!isEqual(a[key], b[key])) return false      }      for (let key in b) {        if (!isEqual(a[key], b[key])) return false      }      return true    } else if (classNameA === '[object Array]') {      if (a.length !== b.length) {        return false      } else {        for (let i = 0, len = a.length; i < len; i++) {          if (!isEqual(a[i], b[i])) return false        }        return true      }    } else if (classNameA === '[object Function]') {      return a.toString() === b.toString()    } else {      return Object.is(a, b)    }  }}

样例

const a = {  arr: [1, true, {a: 6, arr: [9, 0, 6, [5, 9]]}],  d: 0,  obj: { d: 9, arr: [5000]},  e: ()=>{},  f: [0]}const b = {  arr: [1, true, {a: 6, arr: [9, 0, 6, [5, 9]]}],  d: 0,  obj: { d: 9, arr: [5000]},  e: ()=>{},  f: [0]}console.log(isEqual(a, b))