is-number-equal:如果值相同，则返回true

用法 const isNumberEqual = require ( 'is-number-equal' ) ; isNumberEqual ( 9 , 9 ) // true isNumberEqual ( 9 , '9' ) // true isNumberEqual ( '9' , '9' ) // true isNumberEqual ( 0o11 , 9 ) // true isNumberEqual ( 2 , 9 ) // false isNumberEqual ( 'foo' , 'foo' ) // false