JavaScript类型检测最佳实践

- String: typeof object === "string"- Number: typeof object === "number"- Boolean: typeof object === "boolean"- Object: typeof object === "object"- Plain Object: jQuery.isPlainObject( object )- Function: jQuery.isFunction( object )- Array: jQuery.isArray( object )- Element: object.nodeType- null: object === null- null or undefined: object == null- undefined:- Global Variables: typeof variable === "undefined"- Local Variables: variable === undefined- Properties: object.prop === undefined