js implements deep copy code

This article mainly shares with you the js implementation of deep copy code. We will share with you the writing method of es5 and the writing method of es6 respectively, hoping to help everyone.

How to write es5

    function clone(obj) {
        if(obj == null) return null;
        let newObj = obj instanceof Array ? [] : {};
        for(var i in obj) {
            newObj[i] = typeof obj[i] == "object" ? clone(obj[i]) : obj[i];
        }
        return newObj;
    }

How to write es6

    const clone2 = (obj) => {
        let proto = Object.getPrototypeOf(obj);
        return Object.assign({}, Object.create(proto), obj)
    }

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