浏览器默认禁止跨域请求解决办法

在chrome运行项目时、如果demo中有Ajax操作浏览器就会报一个错： AccesstoXMLHttpRequestat’file:///C:/Users/14524/Desktop/QQ%E9%9F%B3%E4%B9%90%E6%92%AD%E6%94%BE%E5%99%A8/source/musiclist.json’ from origin ‘null’ has been blocked

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