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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | 1x 1x 1x 1x 37x 37x 37x 16x 16x 2x 14x 4x 13x 1x 12x 1x 1x 2x 1x 11x 1x 1x 5x 1x 10x 10x 24x 10x 10x 1x 1x 10x | const tagMap = '[object Map]'
const tagSet = '[object Set]'
const tagRegExp = '[object RegExp]'
const tagDate = '[object Date]'
function isObj(input) {
const type = typeof input
return input !== null && (type === 'object' || type === 'function')
}
function clone(val) {
// 1类 基本数据类型 string, number, boolean, null, undefined, symbol
if (!isObj(val)) return val
// 2类 Date, RegExp
const type = Object.prototype.toString.call(val)
if ([tagDate, tagRegExp].includes(type)) {
return new val.constructor(val)
}
// 3类 引用数据类型
if (Array.isArray(val)) {
return val.map(v => clone(v))
} else if (typeof val === 'function') {
return val
} else if (type === tagMap) {
const _map = new Map()
for (const item of val) {
_map.set(item[0], clone(item[1]))
}
return _map
} else if (type === tagSet) {
const _set = new Set()
for (const item of val) {
_set.add(clone(item))
}
return _set
} else {
const _obj = Object.create(Object.getPrototypeOf(val))
for (const key in val) {
_obj[key] = clone(val[key])
}
// 处理使用Symbols作为属性的项目
const _sybKeys = Object.getOwnPropertySymbols(val)
if (_sybKeys.length > 0) {
for (const key of _sybKeys) {
_obj[key] = clone(val[key])
}
}
return _obj
}
}
export default clone |