Comments (1)
实现 instanceOf
/**
* @param {object} obj
* @param {object} target
* @return {boolean}
*/
function myInstanceOf(obj, target) {
// If the object does not exist or we've reached the base Object constructor, return false
if(!obj || typeof obj !== 'object') return false
// Check if the target is a valid object
if(!target.prototype) throw Error
// If the object's prototype matches our target's prototype, return true
// Otherwise, recurse down the prototypal chain
if(Object.getPrototypeOf(obj) === target.prototype) {
return true
} else {
return myInstanceOf(Object.getPrototypeOf(obj), target)
}
}
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