关于origin ‘null’ has been blocked by CORS policy跨域问题解决方法
报错代码:jquery-1.12.4.min.js:4AccesstoXMLHttpRequestat‘file:///C:/url/data.json’fromorigin‘null’hasbeenblockedbyCORSpolicy:Crossoriginrequestsareonlysupportedforprotocolschemes:http,data,chrome,chrome-ex