js前端获取页面传递的参数

转载的，先记下：

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] == '')) {
                         data.push(['']);
                         index[p[0]] = data.length - 1;
                     } else if (typeof (p[0]) == 'undefined' || p[0] == '') {
                         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;
         }
     }
 } ();

调用方法：

 var  idx = UrlParm.parm('IDX');