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This article is about how to make a deep copy of js. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Deep copy

Use the variable a to copy object b, and change the value of b in a, which is called shallow copy. To make an independent of b, you need a deep copy.

Simple treatment

Function deepClone () {return JSON.parse (JSON.stringify (obj))}

Since it is recommended processing, it has its shortcomings, the above is mainly the use of JSON serialization and deserialization. JSON does not support functions and undefined, so it will be missing in these cases, but it can already satisfy most of the cases.

Complex processing

Complex processing needs to be recursive.

Function deepClone (obj) {function isClass (o) {if (o = null) return "Null"; if (o = undefined) return "Undefined"; return Object.prototype.toString.call (o) .slice (8,-1);} var result; var oClass = isClass (obj); if (oClass = = "Object") {result = {};} else if (oClass = = "Array") {result = [];} else {return obj } for (var key in obj) {var copy = obj [key]; if (isClass (copy) = = "Object") {result [key] = arguments.callee (copy); / / Recursive call} else if (isClass (copy) = = "Array") {result [key] = arguments.callee (copy);} else {result [key] = obj [key];}} return result;} Thank you for reading! This is the end of the article on "how to make a deep copy of js". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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