$ Unnecessary escape character: \. no-useless-escape报错

$ Unnecessary escape character: - no-useless-escape

禁用不必要的转义字符; \-

原因：

let reg = /^([a-zA-Z]|[0-9])(\w\\-)+@[a-zA-Z0-9]+\.([a-zA-Z]{2,4})$/

改为

let reg = /^([a-zA-Z]|[0-9])(\w)+@[a-zA-Z0-9]+\.([a-zA-Z]{2,4})$/

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