javascript Object的长度

1.示例

var obj = {
	a:"hello",
	b:"world",
	c:"hehe"
}
var key = 0;
for(var oj in obj) {
	console.log(oj);
	console.log(obj[oj]);
	key++;
}
console.log(key);

console.log(obj.size);
console.log(obj.length);
console.log(Object.keys(obj));
console.log(Object.keys(obj).length );

2.nodejs 运行结果：