typeOf运算符
- 识别所有值类型
- 识别函数
- 判断是否是引用类型(不可再细分)
深拷贝代码
const obj1 = {
age: 20,
name: 'xxx',
address: {
city: 'beijing'
},
arr: ['a', 'b', 'c']
}
const obj2 = deepClone(obj1)
obj2.address.city = 'shanghai'
obj2.arr[0] = 'a1'
console.log(obj1.address.city)
console.log(obj1.arr[0])
function deepClone(obj = {}) {
if (typeof obj !== 'object' || obj == null) {
return obj
}
let result
if (obj instanceof Array) {
result = []
} else {
result = {}
}
for (let key in obj) {
if (obj.hasOwnProperty(key)) {
result[key] = deepClone(obj[key])
}
}
return result
}