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var test = {
    globalVariable: 'abc',
    
    init: function () {
        this.method();
        this.method0();
    },
    
    method: function () {
        ……
    },
    
    method0: function () {
        ……
    }
};

Or

(function () {
    var globalVariable = 'abc';
    
    // init
    method();
    method0();
    
    function method() {
        ……
    }
    function method0() {
        ……
    }
})();

Which one of these two is better? The object method looks very clear, but there are many disadvantages in using it. For example, when looking for methods and variables, you have to put this in front of them. Will this increase unnecessary performance consumption?

Writing it as an object will facilitate expansion, etc. Because inheritance and polymorphism can be carried out in an object-oriented manner. If the program iteration encounters logic that is the same or similar to the logic in the object in the future, it will be much more convenient~