函数的定义 对象 类型转换

if(function y(){}){console.log(1)}

VM142:1 1

undefined

if(z){console.log(1)}

VM144:1 Uncaught ReferenceError: z is not defined

at <anonymous>:1:1

(anonymous) @ VM144:1

if(function y1(){}){console.log(y1)}

VM148:1 Uncaught ReferenceError: y1 is not defined

at <anonymous>:1:33

(anonymous) @ VM148:1

if(function y1(){}){console.log(typeof y1)}

VM168:1 undefined

undefined

 

 

 

函数的两种定义方式