判断JS引用对象类型

get the type of reference type

function getType(foo, type) {
  return Object.prototype.toString.call(foo) == "[Object " + type + "]"
}
 
//ES5 Array 有isArray方法

function isArray(value) {
  if (typeof Array.isArray === "function") {
    return Arrary.isArray(value);
  } else {
    return Object.prototype.toString.call(value) === "[object Arrary]" ;
  }
}