javascript - 如何不在javascript中重新定义变量

Question

每次我调用 Client2.config.select2() 时，所有内容都会重新定义。

有没有办法阻止重新定义这样的函数/对象？ IE。如果我想要另一个变量来保存此对象中的一些元素，运行 Client2.config.select2() 会覆盖它。

是否有一个众所周知的模式可以做到这一点？

Client2.config.select2 = function() {

    var coreIDs    =  ['clientID', 'cptyID' , 'sym'];

    var nonCoreIDs =  ['groupBy','groupBy_impact_1','groupBy_impact_2',
        'groupBy_impact_3','groupBy_impact_4'];

    //non dynamic filters 
    var autoCompleteSettings =  function () {
        return {
            allowClear : true,
            minimumInputLength : 2,
            multiple : true,
            placeholder: "Select ",
            closeOnSelect : false,
            openOnEnter : true,
            ajax: {
                url : "../my?page=search",
                dataType : 'json',
                data : function(term, page) {
                    return {
                        q : term
                    };
                },
                results : function(data, page) {
                    return {
                        results : data
                    };
                }
            }
        };
    };

    var multipleSettings = function () {
        return {
            placeholder : "Select ",
            allowClear : true,
            closeOnSelect : false,
            maximumSelectionSize: 6
        };
    };

    return {
        getAutoCompleteSelectSettings: function() {
            return new autoCompleteSettings();
        },
        getMultipleSelectSettings: function() {
            return new multipleSettings();
        },
        getCoreSelect2IDs: function () {
            return coreIDs;
        },
        getNonCoreSelect2IDs: function () {
            return nonCoreIDs;
        },
        getSelect2IDs : function() {
            return coreIDs.concat(nonCoreIDs);
        }
    }
};

Answer 1

您应该使用模块模式:http://www.adequatelygood.com/JavaScript-Module-Pattern-In-Depth.html

这方面的一个例子是:

(function (CkSpace, $, undefined) {
    CkSpace.GetLoanValues = function () { //public member
       //Do Stuff
    }
    var myNumber = 1; //private member

} (window.CkSpace = window.CkSpace || {}, jQuery));