js中判断变量是函数(function)或window

1.判断变量是否为函数

function isFunction( obj ) {
  return typeof obj === "function" && typeof obj.nodeType !== "number";
}
 // 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.

2.判断变量是否是window

function isWindow( obj ) {
  return obj != null && obj === obj.window;
}