js 对象转&拼接

function pars(param, key, encode) {
            if (param == null) return '';
            var arr = [];
            var t = typeof (param);
            if (t == 'string' || t == 'number' || t == 'boolean') {
                arr.push(key + '=' + ((encode == null || encode) ? encodeURIComponent(param) : param));
            } else {
                for (var i in param) {
                    var k = key == null ? i : key + (param instanceof Array ? '[' + i + ']' : '.' + i);
                    arr.push(pars(param[i], k, encode));
                }
            }
            return arr.join("&");
        };