jquery的变量名加$与不加$的区别？

Question

我用jq一般申明变量也没加$，今天写了些东西，要对引入的文件中的字符串进行多次的处理截取，变量申明了5个，console.log出来结果超过10s，突然试了下给变量名加$，console.log出来结果1s左右。网上一搜，全是说没什么区别，还有说是什么习惯问题？

Answer 1

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Answer 2

变量名加不加$貌似没什么区别