js 获取url参数

UrlParm = function() { // url参数
                var data, index;
                (function init() {
                    data = [];
                    index = {};
                    var u = window.location.search.substr(1);
                    if (u != '') {
                        var parms = decodeURIComponent(u).split('&');
                        for (var i = 0, len = parms.length; i < len; i++) {
                            if (parms[i] != '') {
                                var p = parms[i].split("=");
                                if (p.length == 1 || (p.length == 2 && p[1] == '')) {// p |
                                                                                        // p=
                                    data.push([ '' ]);
                                    index[p[0]] = data.length - 1;
                                } else if (typeof (p[0]) == 'undefined' || p[0] == '') { // =c |
                                                                                            // =
                                    data[0] = [ p[1] ];
                                } else if (typeof (index[p[0]]) == 'undefined') { // c=aaa
                                    data.push([ p[1] ]);
                                    index[p[0]] = data.length - 1;
                                } else {// c=aaa
                                    data[index[p[0]]].push(p[1]);
                                }
                            }
                        }
                    }
                })();
                return {
                    // 获得参数,类似request.getParameter()
                    parm : function(o) { // o: 参数名或者参数次序
                        try {
                            return (typeof (o) == 'number' ? data[o][0] : data[index[o]][0]);
                        } catch (e) {
                        }
                    },
                    // 获得参数组, 类似request.getParameterValues()
                    parmValues : function(o) { // o: 参数名或者参数次序
                        try {
                            return (typeof (o) == 'number' ? data[o] : data[index[o]]);
                        } catch (e) {
                        }
                    },
                    // 是否含有parmName参数
                    hasParm : function(parmName) {
                        return typeof (parmName) == 'string' ? typeof (index[parmName]) != 'undefined'
                                : false;
                    },
                    // 获得参数Map ,类似request.getParameterMap()
                    parmMap : function() {
                        var map = {};
                        try {
                            for ( var p in index) {
                                map[p] = data[index[p]];
                            }
                        } catch (e) {
                        }
                        return map;
                    }
                }
            }();

使用方法 

UrlParm.parm("id");