[untitled] I is circularly accumulated under certain conditions. The condition is usually the length of the loop array. When it exceeds the length, the loop will stop. Because the object cannot judge

Under certain conditions , Yes i Perform cyclic accumulation . The condition is usually the length of the circular array , When the length is exceeded, the cycle stops . Because the object cannot determine the length , So it usually matches Object.keys() Use .\nforEach It is generally believed that Ordinary for loop The enhanced , It can be found that it is better than Ordinary for loop It's a lot simpler in writing , But it's essentially an array loop . Each array element executes a callback function , Do not change the original array , The return value is undefined.\nmap Order each element in the original array