判断类型及深拷贝

佚名 6年前 (2019-04-23) 随笔 484人围观抢沙发百度已收录

function judgeTypeFnCreator (type) { const toString = Object.prototype.toString return function isType (o) { return toString.call(o) === `[object ${type}]` } } const isFunc = judgeTypeFnCreator('Function') const isUndef = judgeTypeFnCreator('Undefined') const isArray = judgeTypeFnCreator('Array') const isString = judgeTypeFnCreator('String') const isObject = judgeTypeFnCreator('Object') const isNumber = judgeTypeFnCreator('Number') function deepAssign(to, from) { for (let key in from) { if (!to[key] || typeof to[key] !== 'object') { to[key] = from[key] } else { deepAssign(to[key], from[key]) } } }