解析URL查询字符串参数为对象

    function getQueryStringArgs() {
        var search = (location.search.length > 0 ? location.search.slice(1) : "");
        var obj = {};
        var reg = /([^?&=]+)=([^?&=]*)/g;
        search.replace(reg, function (match, $1, $2) {
            var name = decodeURIComponent($1);
            var val = decodeURIComponent($2);
            obj[name] = val;
            return match;
        });
        return obj;
    }

    function getElementsByClassName(node, classname) {
        if (node.getElementsByClassName) {
            return node.getElementsByClassName(classname);            
        } else {
            var results = [];
            var elems = node.getElementsByTagName(‘*‘);
            for (var i = 0; i < elems.length; i++) {
                if (elems[i].classname.indexOf(classname) != -1) {
                    results[results.length] = elems[i];
                }
            }
            return results;
        }
    }