打卡判断，增加前端浏览器mac获取，当mac获取为空时不判断

LR-20210131IOQH\Administrator

2021-06-10 6f34ab1ed6f8cb79a012a30a7b687e362c6f16c2

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// Please see documentation at https://docs.microsoft.com/aspnet/core/client-side/bundling-and-minification
// for details on configuring this project to bundle and minify static web assets.
 
// Write your JavaScript code.