var countSum = function (o) {
var t = typeof o;
if (t == "string") {
return o.length;
} else if (t == "object") {
if (Object.prototype.toString.call(o) == "[object Array]") {
return o.length;
}
var n = 0;
for (var i in o) {
n++;
}
return n;
}
};
var a=countSum(ary);
或者直接a.length，这个比较简单简洁