javascript中的正则表达式看不太懂，求解释

 <script type="text/javascript">
                        /* 赋值合同行下标 */
                        var electronicContractRowIdx = 0,
                            /* 获取合同模板 */
                            electronicContractTpl = $("#electronicContractTpl")
                            .html().replace(/(\/\/\<!\-\-)|(\/\/\-\->)/g,"");
                            alert("合同模板---"+electronicContractTpl);
                        $(document).ready(function() {
                            var data = ${fns:toJson(investProject.electronicContractList)};
                            alert("toJSON---"+data);
                            for (var i=0; i<data.length; i++){
                                //d
                                addRow('#electronicContractList', electronicContractRowIdx, electronicContractTpl, data[i]);
                                electronicContractRowIdx = electronicContractRowIdx + 1;
                            };
                        });