javascript的typeof使用

原网页 http://www.web-jia.com/view.php?a=23​

这个typeof我也用过好多次了，经常会忘记这次特意记录一下Undefined "undefined"Null "object" (see below)Boolean "boolean"Number "number"String "string"Symbol (new in ECMAScript 2015) "symbol"Host object (provided by the JS environment) Implementation-dependentFunction object (implements [[Call]] in ECMA-262 terms) "function"Any other object "object"其中有一条要记录一下typeof null === 'object';