深拷贝

const checkType = source => Object.prototype.toString.call(source).slice(8, -1) const deepClone = source => { let target = null const sourceType = checkType(source) if (sourceType === 'Object') { target = {} } else if (sourceType === 'Array') { target = [] } else { return source } for (let key in source) { if (source.hasOwnProperty(key)) { // in会遍历数组原型上的属性 target[key] = deepClone(source[key]) // 递归拷贝 } } return target }

 

深度比较

const checkType = source => Object.prototype.toString.call(source).slice(8, -1) const deepCompare = (obj1, obj2) => { if (checkType(obj1) !== checkType(obj2)) { return false } if (obj1 === obj2) { return true } if (Object.keys(obj1).length !== Object.keys(obj2).length) { return false } for (let key in obj1) { if (obj1.hasOwnProperty(key) && obj2.hasOwnProperty(key)) { const res = deepCompare(obj1[key], deepCompare(obj2)) // 递归比较 if (!res) { return false } } } return true }