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-dependent Function 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';