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// 判断arr是否为一个数组，返回一个bool值
function isArray (arr) {
return Object.prototype.toString.call(arr) === '[object Array]';
}
// 深度克隆
function deepClone (obj) {
// 对常见的“非”值，直接返回原来值
if([null, undefined, NaN, false].includes(obj)) return obj;
if(typeof obj !== "object" && typeof obj !== 'function') {
//原始类型直接返回
return obj;
var o = isArray(obj) ? [] : {};
for(let i in obj) {
if(obj.hasOwnProperty(i)){
o[i] = typeof obj[i] === "object" ? deepClone(obj[i]) : obj[i];
return o;
export default deepClone;