var obj = json["a"];获取的是json对象 遍历时可以判断数据类型typeof instanceof
json中可能包含object、array和简单类型(string、number、boolean),给你两个判断是object还是array的方法: function isArray(it) { return it && it instanceof Array || typeof it == "array"; }function isObject(it) { return it && typeof it == "object"; }
遍历时可以判断数据类型typeof instanceof
function isArray(it) {
return it && it instanceof Array || typeof it == "array";
}function isObject(it) {
return it && typeof it == "object";
}