Web Front-endJS TutorialJavascript shallow copy and deep copy implementation code_javascript skillsJavascript shallow copy and deep copy implementation code_javascript skills
What is "clone"?
In the actual programming process, we often encounter this situation: there is an object A. At a certain moment, A already contains some valid values. At this time, a new object B that is exactly the same as A may be needed. And any subsequent changes to B will not affect the value in A. That is to say, A and B are two independent objects, but the initial value of B is determined by the A object. In the Java/javascript language, this need cannot be met with a simple assignment statement. Although there are many ways to meet this demand, implementing the clone() method is the simplest and most efficient method. Of course, there is no such method in the JavaScript language.
So I specially wrote two cloning methods: One is a shallow copy and the other is a deep copy.
Explanation:
Shallow copy (shadow clone): Only the basic type and object type of the object are copied, which still belongs to the original reference.
Deep copy (deep clone) : Not only the basic class of the object is copied, but also the objects in the original object are copied. That is to say, the new object is completely generated.
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The Role of C/C in JavaScript Interpreters and CompilersApr 20, 2025 am 12:01 AMC and C play a vital role in the JavaScript engine, mainly used to implement interpreters and JIT compilers. 1) C is used to parse JavaScript source code and generate an abstract syntax tree. 2) C is responsible for generating and executing bytecode. 3) C implements the JIT compiler, optimizes and compiles hot-spot code at runtime, and significantly improves the execution efficiency of JavaScript.
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