typeof(true);//boolean
typeof(undefined);//undefined
typeof(null);//object
typeof(NaN);//number
typeof(1);//number
typeof('1');//string
typeof(Function);//function
typeof(function);//报错
typeof(true);//boolean
typeof(undefined);//undefined
typeof(null);//object
typeof(NaN);//number
typeof(1);//number
typeof('1');//string
typeof(Function);//function
typeof(function);//报错