2021-08-26 23:38:51 【Shang Silicon Valley iron powder】
JS With a memory management engine , Responsible for creating objects 、 Destroy object , And garbage collection . In this issue, we will discuss the garbage collection mechanism . Garbage collection mechanism is mainly composed of a garbage collector （garbage collector, abbreviation GC） The background process of is responsible for monitoring 、 Clean up objects , And reclaim the free memory in time .
Every stage in the memory life cycle :
Allocate memory — Memory is allocated by the operating system , It allows your program to use it . In low-level language ( for example C Language ) in , This is an explicit operation that developers need to handle by themselves . However , In advanced languages , The system will automatically assign you inner .
Using memory — This is the memory allocated before the program actually uses it , When using assigned variables in code , There will be read and write operations .
Free memory — Free up all memory that is no longer in use , Make it free memory , And can be reused . It's the same as allocating memory , This operation also needs to be performed explicitly in low-level languages .
Four common memory leaks ： Global variables , Timer not cleared , Closure , as well as dom References to
- Global variables no need var Declared variables , Equivalent to mounting to window On the object . Such as ：b=1; solve ： Using strict mode
- Forgotten timer and callback functions
- Not cleaned up DOM Element reference
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