1. 安装
npm install -g jshint
2.使用
1）单文件
jshint main.js
2)文件夹
$ jshint folder/*
输出类似下面的,对应修改就行了：
js/main.js: line 1, col 20, Missing semicolon.
js/main.js: line 2, col 24, Missing semicolon.
js/main.js: line 3, col 20, Missing semicolon.
js/main.js: line 6, col 17, Missing semicolon.
js/main.js: line 5, col 10, 'add' is defined but never used.
3.参考
文档：http://jshint.com/docs/