js如何判断一个对象是函数类型

判断一个对象是函数

//来自jq源码
function isFunction( obj ) {
  // Support: Chrome <=57, Firefox <=52
  // In some browsers, typeof returns "function" for HTML <object> elements
  // (i.e., `typeof document.createElement( "object" ) === "function"`).
  // We don't want to classify *any* DOM node as a function.
  return typeof obj === "function" && typeof obj.nodeType !== "number";
}