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This article mainly introduces "javascript reference count introduction and example usage", in daily operation, I believe many people in javascript reference count introduction and example usage problems have doubts, small make up consult all kinds of information, sort out simple and easy to use operation method, hope to answer "javascript reference count introduction and example usage" doubts helpful! Next, please follow the small series to learn together!

Reference count means that the language engine has a reference table that holds the number of references to all resources in memory.

If a value has zero references, the table indicates that the value is no longer in use, so the memory can be freed.

If a value is no longer needed but the number of references is not zero, garbage collection fails to free the memory, resulting in a memory leak.

var arr = [1, 2, 3, 4];arr = [2, 4, 5]console.log ('wave boat ');

The biggest problem with reference counts is circular references. To solve the problem of circular references, it is best to manually set null when not in use.

obj1 = null; obj2 = null; At this point, the study of "Introduction and Example Usage of JavaScript Reference Counting" is over, hoping to solve everyone's doubts. Theory and practice can better match to help everyone learn, go and try it! If you want to continue learning more relevant knowledge, please continue to pay attention to the website, Xiaobian will continue to strive to bring more practical articles for everyone!

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